125440535491 has 16 divisors (see below), whose sum is σ = 130370947200. Its totient is φ = 120593138688.

The previous prime is 125440535449. The next prime is 125440535513. The reversal of 125440535491 is 194535044521.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125440535491 is a prime.

It is a super-2 number, since 2×125440535491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125440535401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4890486 + ... + 4916068.

It is an arithmetic number, because the mean of its divisors is an integer number (8148184200).

Almost surely, 2^125440535491 is an apocalyptic number.

125440535491 is a deficient number, since it is larger than the sum of its proper divisors (4930411709).

125440535491 is a wasteful number, since it uses less digits than its factorization.

125440535491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27198.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 125440535491 in words is "one hundred twenty-five billion, four hundred forty million, five hundred thirty-five thousand, four hundred ninety-one".