125771631 has 4 divisors (see below), whose sum is σ = 167695512. Its totient is φ = 83847752.

The previous prime is 125771587. The next prime is 125771647. The reversal of 125771631 is 136177521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136177521 = 3 ⋅45392507.

It is a cyclic number.

It is not a de Polignac number, because 125771631 - 2⁹ = 125771119 is a prime.

It is a super-2 number, since 2×125771631² = 31637006328800322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125771592 and 125771601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125771531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20961936 + ... + 20961941.

It is an arithmetic number, because the mean of its divisors is an integer number (41923878).

Almost surely, 2^125771631 is an apocalyptic number.

125771631 is a deficient number, since it is larger than the sum of its proper divisors (41923881).

125771631 is an equidigital number, since it uses as much as digits as its factorization.

125771631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41923880.

The product of its digits is 8820, while the sum is 33.

The square root of 125771631 is about 11214.7951831498. The cubic root of 125771631 is about 501.0267315349.

The spelling of 125771631 in words is "one hundred twenty-five million, seven hundred seventy-one thousand, six hundred thirty-one".