125506681 has 2 divisors, whose sum is σ = 125506682. Its totient is φ = 125506680.

The previous prime is 125506669. The next prime is 125506687. The reversal of 125506681 is 186605521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123010281 + 2496400 = 11091^2 + 1580^2 .

It is an emirp because it is prime and its reverse (186605521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125506681 - 2¹⁹ = 124982393 is a prime.

It is a super-2 number, since 2×125506681² = 31503853951271522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125506687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62753340 + 62753341.

It is an arithmetic number, because the mean of its divisors is an integer number (62753341).

Almost surely, 2^125506681 is an apocalyptic number.

It is an amenable number.

125506681 is a deficient number, since it is larger than the sum of its proper divisors (1).

125506681 is an equidigital number, since it uses as much as digits as its factorization.

125506681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 125506681 is about 11202.9764348587. The cubic root of 125506681 is about 500.6746639144.

The spelling of 125506681 in words is "one hundred twenty-five million, five hundred six thousand, six hundred eighty-one".