249320881 has 2 divisors, whose sum is σ = 249320882. Its totient is φ = 249320880.

The previous prime is 249320857. The next prime is 249320893. The reversal of 249320881 is 188023942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249008400 + 312481 = 15780^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 249320881 - 2⁵ = 249320849 is a prime.

It is a super-2 number, since 2×249320881² = 124321803405232322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 249320881.

It is not a weakly prime, because it can be changed into another prime (249320081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124660440 + 124660441.

It is an arithmetic number, because the mean of its divisors is an integer number (124660441).

Almost surely, 2^249320881 is an apocalyptic number.

It is an amenable number.

249320881 is a deficient number, since it is larger than the sum of its proper divisors (1).

249320881 is an equidigital number, since it uses as much as digits as its factorization.

249320881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 249320881 is about 15789.8980680687. The cubic root of 249320881 is about 629.3895834363.

The spelling of 249320881 in words is "two hundred forty-nine million, three hundred twenty thousand, eight hundred eighty-one".