51249967 has 2 divisors, whose sum is σ = 51249968. Its totient is φ = 51249966.

The previous prime is 51249929. The next prime is 51249997. The reversal of 51249967 is 76994215.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51249967 - 2⁷ = 51249839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51249997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624983 + 25624984.

It is an arithmetic number, because the mean of its divisors is an integer number (25624984).

Almost surely, 2^51249967 is an apocalyptic number.

51249967 is a deficient number, since it is larger than the sum of its proper divisors (1).

51249967 is an equidigital number, since it uses as much as digits as its factorization.

51249967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 51249967 is about 7158.9082268178. The cubic root of 51249967 is about 371.4478623469.

The spelling of 51249967 in words is "fifty-one million, two hundred forty-nine thousand, nine hundred sixty-seven".