2551237961 has 2 divisors, whose sum is σ = 2551237962. Its totient is φ = 2551237960.

The previous prime is 2551237921. The next prime is 2551237963. The reversal of 2551237961 is 1697321552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2273382400 + 277855561 = 47680^2 + 16669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551237961 is a prime.

Together with 2551237963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2551237963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275618980 + 1275618981.

It is an arithmetic number, because the mean of its divisors is an integer number (1275618981).

Almost surely, 2^2551237961 is an apocalyptic number.

It is an amenable number.

2551237961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551237961 is an equidigital number, since it uses as much as digits as its factorization.

2551237961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 41.

The square root of 2551237961 is about 50509.7808449017. The cubic root of 2551237961 is about 1366.4182570984.

The spelling of 2551237961 in words is "two billion, five hundred fifty-one million, two hundred thirty-seven thousand, nine hundred sixty-one".