249505877 has 2 divisors, whose sum is σ = 249505878. Its totient is φ = 249505876.

The previous prime is 249505871. The next prime is 249505903. The reversal of 249505877 is 778505942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171112561 + 78393316 = 13081^2 + 8854^2 .

It is a cyclic number.

It is not a de Polignac number, because 249505877 - 2¹⁸ = 249243733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249505871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124752938 + 124752939.

It is an arithmetic number, because the mean of its divisors is an integer number (124752939).

Almost surely, 2^249505877 is an apocalyptic number.

It is an amenable number.

249505877 is a deficient number, since it is larger than the sum of its proper divisors (1).

249505877 is an equidigital number, since it uses as much as digits as its factorization.

249505877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 249505877 is about 15795.7550310202. The cubic root of 249505877 is about 629.5452138949.

The spelling of 249505877 in words is "two hundred forty-nine million, five hundred five thousand, eight hundred seventy-seven".