249912521 has 2 divisors, whose sum is σ = 249912522. Its totient is φ = 249912520.

The previous prime is 249912511. The next prime is 249912527. The reversal of 249912521 is 125219942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188760121 + 61152400 = 13739^2 + 7820^2 .

It is a cyclic number.

It is not a de Polignac number, because 249912521 - 2²² = 245718217 is a prime.

It is not a weakly prime, because it can be changed into another prime (249912527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124956260 + 124956261.

It is an arithmetic number, because the mean of its divisors is an integer number (124956261).

Almost surely, 2^249912521 is an apocalyptic number.

It is an amenable number.

249912521 is a deficient number, since it is larger than the sum of its proper divisors (1).

249912521 is an equidigital number, since it uses as much as digits as its factorization.

249912521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 249912521 is about 15808.6217299295. The cubic root of 249912521 is about 629.8870386197.

The spelling of 249912521 in words is "two hundred forty-nine million, nine hundred twelve thousand, five hundred twenty-one".