125877581 has 2 divisors, whose sum is σ = 125877582. Its totient is φ = 125877580.

The previous prime is 125877569. The next prime is 125877601. The reversal of 125877581 is 185778521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119552356 + 6325225 = 10934^2 + 2515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125877581 is a prime.

It is a super-2 number, since 2×125877581² = 31690330796823122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125877511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62938790 + 62938791.

It is an arithmetic number, because the mean of its divisors is an integer number (62938791).

Almost surely, 2^125877581 is an apocalyptic number.

It is an amenable number.

125877581 is a deficient number, since it is larger than the sum of its proper divisors (1).

125877581 is an equidigital number, since it uses as much as digits as its factorization.

125877581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 44.

The square root of 125877581 is about 11219.5178595161. The cubic root of 125877581 is about 501.1673803252.

The spelling of 125877581 in words is "one hundred twenty-five million, eight hundred seventy-seven thousand, five hundred eighty-one".