51251951 has 2 divisors, whose sum is σ = 51251952. Its totient is φ = 51251950.

The previous prime is 51251947. The next prime is 51252013. The reversal of 51251951 is 15915215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51251951 - 2² = 51251947 is a 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 (51251051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25625975 + 25625976.

It is an arithmetic number, because the mean of its divisors is an integer number (25625976).

Almost surely, 2^51251951 is an apocalyptic number.

51251951 is a deficient number, since it is larger than the sum of its proper divisors (1).

51251951 is an equidigital number, since it uses as much as digits as its factorization.

51251951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250, while the sum is 29.

The square root of 51251951 is about 7159.0467940921. The cubic root of 51251951 is about 371.4526554755.

The spelling of 51251951 in words is "fifty-one million, two hundred fifty-one thousand, nine hundred fifty-one".