125005491 has 16 divisors (see below), whose sum is σ = 199439520. Its totient is φ = 76926240.

The previous prime is 125005481. The next prime is 125005493. The reversal of 125005491 is 194500521.

It is not a de Polignac number, because 125005491 - 2¹⁵ = 124972723 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (125005493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177720 + ... + 178421.

It is an arithmetic number, because the mean of its divisors is an integer number (12464970).

Almost surely, 2^125005491 is an apocalyptic number.

125005491 is a deficient number, since it is larger than the sum of its proper divisors (74434029).

125005491 is a wasteful number, since it uses less digits than its factorization.

125005491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356163 (or 356157 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 125005491 is about 11180.5854497875. The cubic root of 125005491 is about 500.0073212261.

The spelling of 125005491 in words is "one hundred twenty-five million, five thousand, four hundred ninety-one".