51751949 has 2 divisors, whose sum is σ = 51751950. Its totient is φ = 51751948.

The previous prime is 51751913. The next prime is 51751957. The reversal of 51751949 is 94915715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 12376324 = 6275^2 + 3518^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51751949 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 (51751549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25875974 + 25875975.

It is an arithmetic number, because the mean of its divisors is an integer number (25875975).

Almost surely, 2^51751949 is an apocalyptic number.

It is an amenable number.

51751949 is a deficient number, since it is larger than the sum of its proper divisors (1).

51751949 is an equidigital number, since it uses as much as digits as its factorization.

51751949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 51751949 is about 7193.8827485580. The cubic root of 51751949 is about 372.6566738801.

The spelling of 51751949 in words is "fifty-one million, seven hundred fifty-one thousand, nine hundred forty-nine".