125661919 has 2 divisors, whose sum is σ = 125661920. Its totient is φ = 125661918.

The previous prime is 125661829. The next prime is 125661937. The reversal of 125661919 is 919166521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125661919 - 2⁷ = 125661791 is a prime.

It is a super-2 number, since 2×125661919² = 31581835773525122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125664919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62830959 + 62830960.

It is an arithmetic number, because the mean of its divisors is an integer number (62830960).

Almost surely, 2^125661919 is an apocalyptic number.

125661919 is a deficient number, since it is larger than the sum of its proper divisors (1).

125661919 is an equidigital number, since it uses as much as digits as its factorization.

125661919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 125661919 is about 11209.9027203629. The cubic root of 125661919 is about 500.8810054138.

The spelling of 125661919 in words is "one hundred twenty-five million, six hundred sixty-one thousand, nine hundred nineteen".