249461551 has 2 divisors, whose sum is σ = 249461552. Its totient is φ = 249461550.

The previous prime is 249461543. The next prime is 249461579. The reversal of 249461551 is 155164942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249461551 - 2³ = 249461543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249461551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249461591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124730775 + 124730776.

It is an arithmetic number, because the mean of its divisors is an integer number (124730776).

Almost surely, 2^249461551 is an apocalyptic number.

249461551 is a deficient number, since it is larger than the sum of its proper divisors (1).

249461551 is an equidigital number, since it uses as much as digits as its factorization.

249461551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 249461551 is about 15794.3518702098. The cubic root of 249461551 is about 629.5079310405.

The spelling of 249461551 in words is "two hundred forty-nine million, four hundred sixty-one thousand, five hundred fifty-one".