125321491 has 2 divisors, whose sum is σ = 125321492. Its totient is φ = 125321490.

The previous prime is 125321489. The next prime is 125321513. The reversal of 125321491 is 194123521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125321491 - 2¹ = 125321489 is a prime.

It is a super-2 number, since 2×125321491² = 31410952212926162, which contains 22 as substring.

Together with 125321489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125321401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62660745 + 62660746.

It is an arithmetic number, because the mean of its divisors is an integer number (62660746).

Almost surely, 2^125321491 is an apocalyptic number.

125321491 is a deficient number, since it is larger than the sum of its proper divisors (1).

125321491 is an equidigital number, since it uses as much as digits as its factorization.

125321491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 125321491 is about 11194.7081694879. The cubic root of 125321491 is about 500.4282877012.

The spelling of 125321491 in words is "one hundred twenty-five million, three hundred twenty-one thousand, four hundred ninety-one".