249674921 has 2 divisors, whose sum is σ = 249674922. Its totient is φ = 249674920.

The previous prime is 249674881. The next prime is 249674933. The reversal of 249674921 is 129476942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248377600 + 1297321 = 15760^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249674921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249670921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124837460 + 124837461.

It is an arithmetic number, because the mean of its divisors is an integer number (124837461).

Almost surely, 2^249674921 is an apocalyptic number.

It is an amenable number.

249674921 is a deficient number, since it is larger than the sum of its proper divisors (1).

249674921 is an equidigital number, since it uses as much as digits as its factorization.

249674921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 249674921 is about 15801.1050562927. The cubic root of 249674921 is about 629.6873572618.

The spelling of 249674921 in words is "two hundred forty-nine million, six hundred seventy-four thousand, nine hundred twenty-one".