274432391 has 2 divisors, whose sum is σ = 274432392. Its totient is φ = 274432390.

The previous prime is 274432337. The next prime is 274432399. The reversal of 274432391 is 193234472.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-274432391 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (274432399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137216195 + 137216196.

It is an arithmetic number, because the mean of its divisors is an integer number (137216196).

Almost surely, 2^274432391 is an apocalyptic number.

274432391 is a deficient number, since it is larger than the sum of its proper divisors (1).

274432391 is an equidigital number, since it uses as much as digits as its factorization.

274432391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 35.

The square root of 274432391 is about 16566.0010563805. The cubic root of 274432391 is about 649.8480046970.

Subtracting from 274432391 its sum of digits (35), we obtain a square (274432356 = 16566²).

The spelling of 274432391 in words is "two hundred seventy-four million, four hundred thirty-two thousand, three hundred ninety-one".