140616561 has 4 divisors (see below), whose sum is σ = 187488752. Its totient is φ = 93744372.

The previous prime is 140616551. The next prime is 140616599. The reversal of 140616561 is 165616041.

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: 165616041 = 3 ⋅55205347.

It is not a de Polignac number, because 140616561 - 2²⁵ = 107062129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140616551) 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, 23436091 + ... + 23436096.

It is an arithmetic number, because the mean of its divisors is an integer number (46872188).

Almost surely, 2^140616561 is an apocalyptic number.

It is an amenable number.

140616561 is a deficient number, since it is larger than the sum of its proper divisors (46872191).

140616561 is an equidigital number, since it uses as much as digits as its factorization.

140616561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46872190.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 140616561 is about 11858.1854008107. The cubic root of 140616561 is about 520.0105532868.

The spelling of 140616561 in words is "one hundred forty million, six hundred sixteen thousand, five hundred sixty-one".