251406427 has 2 divisors, whose sum is σ = 251406428. Its totient is φ = 251406426.

The previous prime is 251406403. The next prime is 251406433. The reversal of 251406427 is 724604152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251406427 - 2⁷ = 251406299 is a prime.

It is not a weakly prime, because it can be changed into another prime (251406457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125703213 + 125703214.

It is an arithmetic number, because the mean of its divisors is an integer number (125703214).

Almost surely, 2^251406427 is an apocalyptic number.

251406427 is a deficient number, since it is larger than the sum of its proper divisors (1).

251406427 is an equidigital number, since it uses as much as digits as its factorization.

251406427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 251406427 is about 15855.8010519809. The cubic root of 251406427 is about 631.1396412376.

The spelling of 251406427 in words is "two hundred fifty-one million, four hundred six thousand, four hundred twenty-seven".