40125561 has 24 divisors (see below), whose sum is σ = 62955360. Its totient is φ = 22663872.

The previous prime is 40125541. The next prime is 40125581. The reversal of 40125561 is 16552104.

It is an interprime number because it is at equal distance from previous prime (40125541) and next prime (40125581).

It is not a de Polignac number, because 40125561 - 2⁶ = 40125497 is a prime.

It is a super-2 number, since 2×40125561² = 3220121291129442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40125521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11550 + ... + 14616.

It is an arithmetic number, because the mean of its divisors is an integer number (2623140).

Almost surely, 2^40125561 is an apocalyptic number.

It is an amenable number.

40125561 is a deficient number, since it is larger than the sum of its proper divisors (22829799).

40125561 is a wasteful number, since it uses less digits than its factorization.

40125561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173 (or 3166 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 40125561 is about 6334.4740113130. The cubic root of 40125561 is about 342.3526593764.

Adding to 40125561 its reverse (16552104), we get a palindrome (56677665).

The spelling of 40125561 in words is "forty million, one hundred twenty-five thousand, five hundred sixty-one".