40125881 has 2 divisors, whose sum is σ = 40125882. Its totient is φ = 40125880.

The previous prime is 40125859. The next prime is 40125887. The reversal of 40125881 is 18852104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36481600 + 3644281 = 6040^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 40125881 - 2⁶ = 40125817 is a prime.

It is a super-2 number, since 2×40125881² = 3220172652052322, which contains 22 as substring.

It is equal to p_2440856 and since 40125881 and 2440856 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40125887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20062940 + 20062941.

It is an arithmetic number, because the mean of its divisors is an integer number (20062941).

Almost surely, 2^40125881 is an apocalyptic number.

It is an amenable number.

40125881 is a deficient number, since it is larger than the sum of its proper divisors (1).

40125881 is an equidigital number, since it uses as much as digits as its factorization.

40125881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 40125881 is about 6334.4992698713. The cubic root of 40125881 is about 342.3535694577.

Adding to 40125881 its reverse (18852104), we get a palindrome (58977985).

The spelling of 40125881 in words is "forty million, one hundred twenty-five thousand, eight hundred eighty-one".