125618881 has 2 divisors, whose sum is σ = 125618882. Its totient is φ = 125618880.

The previous prime is 125618879. The next prime is 125618917. The reversal of 125618881 is 188816521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83887281 + 41731600 = 9159^2 + 6460^2 .

It is a cyclic number.

It is not a de Polignac number, because 125618881 - 2¹ = 125618879 is a prime.

It is a super-2 number, since 2×125618881² = 31560206527384322, which contains 22 as substring.

Together with 125618879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125618081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62809440 + 62809441.

It is an arithmetic number, because the mean of its divisors is an integer number (62809441).

Almost surely, 2^125618881 is an apocalyptic number.

It is an amenable number.

125618881 is a deficient number, since it is larger than the sum of its proper divisors (1).

125618881 is an equidigital number, since it uses as much as digits as its factorization.

125618881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 40.

The square root of 125618881 is about 11207.9829139770. The cubic root of 125618881 is about 500.8238165737.

The spelling of 125618881 in words is "one hundred twenty-five million, six hundred eighteen thousand, eight hundred eighty-one".