140015561 has 8 divisors (see below), whose sum is σ = 165179904. Its totient is φ = 116141760.

The previous prime is 140015549. The next prime is 140015563. The reversal of 140015561 is 165510041.

140015561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140015561 - 2⁶ = 140015497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140015563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322400 + ... + 322833.

It is an arithmetic number, because the mean of its divisors is an integer number (20647488).

Almost surely, 2^140015561 is an apocalyptic number.

It is an amenable number.

140015561 is a deficient number, since it is larger than the sum of its proper divisors (25164343).

140015561 is an equidigital number, since it uses as much as digits as its factorization.

140015561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645271.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 140015561 is about 11832.8171201958. The cubic root of 140015561 is about 519.2686476630.

It can be divided in two parts, 1400 and 15561, that added together give a palindrome (16961).

The spelling of 140015561 in words is "one hundred forty million, fifteen thousand, five hundred sixty-one".