51918551 has 2 divisors, whose sum is σ = 51918552. Its totient is φ = 51918550.

The previous prime is 51918547. The next prime is 51918589. The reversal of 51918551 is 15581915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51918551 - 2² = 51918547 is a prime.

It is a Sophie Germain 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 (51918851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25959275 + 25959276.

It is an arithmetic number, because the mean of its divisors is an integer number (25959276).

Almost surely, 2^51918551 is an apocalyptic number.

51918551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51918551 is an equidigital number, since it uses as much as digits as its factorization.

51918551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 35.

The square root of 51918551 is about 7205.4528657122. The cubic root of 51918551 is about 373.0561360885.

The spelling of 51918551 in words is "fifty-one million, nine hundred eighteen thousand, five hundred fifty-one".