274399991 has 2 divisors, whose sum is σ = 274399992. Its totient is φ = 274399990.

The previous prime is 274399987. The next prime is 274400011. The reversal of 274399991 is 199993472.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 274399991 - 2² = 274399987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (271399991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137199995 + 137199996.

It is an arithmetic number, because the mean of its divisors is an integer number (137199996).

Almost surely, 2^274399991 is an apocalyptic number.

274399991 is a deficient number, since it is larger than the sum of its proper divisors (1).

274399991 is an equidigital number, since it uses as much as digits as its factorization.

274399991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 53.

The square root of 274399991 is about 16565.0231210222. The cubic root of 274399991 is about 649.8224296013.

The spelling of 274399991 in words is "two hundred seventy-four million, three hundred ninety-nine thousand, nine hundred ninety-one".