125987945391 has 36 divisors (see below), whose sum is σ = 230938951464. Its totient is φ = 65448280800.

The previous prime is 125987945381. The next prime is 125987945407. The reversal of 125987945391 is 193549789521.

125987945391 is a `hidden beast` number, since 1 + 2 + 5 + 9 + 8 + 7 + 94 + 539 + 1 = 666.

It is not a de Polignac number, because 125987945391 - 2⁷ = 125987945263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125987945381) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12980920 + ... + 12990621.

It is an arithmetic number, because the mean of its divisors is an integer number (6414970874).

Almost surely, 2^125987945391 is an apocalyptic number.

125987945391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

125987945391 is a deficient number, since it is larger than the sum of its proper divisors (104951006073).

125987945391 is a wasteful number, since it uses less digits than its factorization.

125987945391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25971572 (or 25971562 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 63.

The spelling of 125987945391 in words is "one hundred twenty-five billion, nine hundred eighty-seven million, nine hundred forty-five thousand, three hundred ninety-one".