247990877 has 2 divisors, whose sum is σ = 247990878. Its totient is φ = 247990876.

The previous prime is 247990871. The next prime is 247990903. The reversal of 247990877 is 778099742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214651801 + 33339076 = 14651^2 + 5774^2 .

It is a cyclic number.

It is not a de Polignac number, because 247990877 - 2¹⁶ = 247925341 is a prime.

It is a super-2 number, since 2×247990877² = 122998950150458258, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247990871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123995438 + 123995439.

It is an arithmetic number, because the mean of its divisors is an integer number (123995439).

Almost surely, 2^247990877 is an apocalyptic number.

It is an amenable number.

247990877 is a deficient number, since it is larger than the sum of its proper divisors (1).

247990877 is an equidigital number, since it uses as much as digits as its factorization.

247990877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 247990877 is about 15747.7260898201. The cubic root of 247990877 is about 628.2684264011.

The spelling of 247990877 in words is "two hundred forty-seven million, nine hundred ninety thousand, eight hundred seventy-seven".