51490259 has 2 divisors, whose sum is σ = 51490260. Its totient is φ = 51490258.

The previous prime is 51490253. The next prime is 51490267. The reversal of 51490259 is 95209415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51490259 - 2²⁰ = 50441683 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51490253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25745129 + 25745130.

It is an arithmetic number, because the mean of its divisors is an integer number (25745130).

Almost surely, 2^51490259 is an apocalyptic number.

51490259 is a deficient number, since it is larger than the sum of its proper divisors (1).

51490259 is an equidigital number, since it uses as much as digits as its factorization.

51490259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 51490259 is about 7175.6713274787. The cubic root of 51490259 is about 372.0274842876.

The spelling of 51490259 in words is "fifty-one million, four hundred ninety thousand, two hundred fifty-nine".