140656537 has 4 divisors (see below), whose sum is σ = 160750336. Its totient is φ = 120562740.

The previous prime is 140656511. The next prime is 140656561. The reversal of 140656537 is 735656041.

140656537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735656041 = 19 ⋅38718739.

It is a cyclic number.

It is not a de Polignac number, because 140656537 - 2²³ = 132267929 is a prime.

It is a super-2 number, since 2×140656537² = 39568522801664738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140656496 and 140656505.

It is not an unprimeable number, because it can be changed into a prime (140656507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10046889 + ... + 10046902.

It is an arithmetic number, because the mean of its divisors is an integer number (40187584).

Almost surely, 2^140656537 is an apocalyptic number.

It is an amenable number.

140656537 is a deficient number, since it is larger than the sum of its proper divisors (20093799).

140656537 is an equidigital number, since it uses as much as digits as its factorization.

140656537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20093798.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 140656537 is about 11859.8708677624. The cubic root of 140656537 is about 520.0598266965.

It can be divided in two parts, 14065 and 6537, that added together give a palindrome (20602).

The spelling of 140656537 in words is "one hundred forty million, six hundred fifty-six thousand, five hundred thirty-seven".