249491491 has 2 divisors, whose sum is σ = 249491492. Its totient is φ = 249491490.

The previous prime is 249491483. The next prime is 249491533. The reversal of 249491491 is 194194942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249491491 - 2³ = 249491483 is a prime.

It is not a weakly prime, because it can be changed into another prime (249401491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124745745 + 124745746.

It is an arithmetic number, because the mean of its divisors is an integer number (124745746).

Almost surely, 2^249491491 is an apocalyptic number.

249491491 is a deficient number, since it is larger than the sum of its proper divisors (1).

249491491 is an equidigital number, since it uses as much as digits as its factorization.

249491491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 249491491 is about 15795.2996489462. The cubic root of 249491491 is about 629.5331142313.

The spelling of 249491491 in words is "two hundred forty-nine million, four hundred ninety-one thousand, four hundred ninety-one".