249344991 has 12 divisors (see below), whose sum is σ = 411617232. Its totient is φ = 142482816.

The previous prime is 249344983. The next prime is 249344993. The reversal of 249344991 is 199443942.

It is not a de Polignac number, because 249344991 - 2³ = 249344983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249344993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1978866 + ... + 1978991.

It is an arithmetic number, because the mean of its divisors is an integer number (34301436).

Almost surely, 2^249344991 is an apocalyptic number.

249344991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

249344991 is a deficient number, since it is larger than the sum of its proper divisors (162272241).

249344991 is a wasteful number, since it uses less digits than its factorization.

249344991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957870 (or 3957867 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 249344991 is about 15790.6615124256. The cubic root of 249344991 is about 629.4098706711.

The spelling of 249344991 in words is "two hundred forty-nine million, three hundred forty-four thousand, nine hundred ninety-one".