51981151 has 2 divisors, whose sum is σ = 51981152. Its totient is φ = 51981150.

The previous prime is 51981067. The next prime is 51981191. The reversal of 51981151 is 15118915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51981151 - 2¹⁷ = 51850079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51981191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25990575 + 25990576.

It is an arithmetic number, because the mean of its divisors is an integer number (25990576).

Almost surely, 2^51981151 is an apocalyptic number.

51981151 is a deficient number, since it is larger than the sum of its proper divisors (1).

51981151 is an equidigital number, since it uses as much as digits as its factorization.

51981151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 31.

The square root of 51981151 is about 7209.7954894713. The cubic root of 51981151 is about 373.2060114476.

The spelling of 51981151 in words is "fifty-one million, nine hundred eighty-one thousand, one hundred fifty-one".