51981067 has 2 divisors, whose sum is σ = 51981068. Its totient is φ = 51981066.

The previous prime is 51981047. The next prime is 51981151. The reversal of 51981067 is 76018915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51981067 - 2¹¹ = 51979019 is a prime.

It is not a weakly prime, because it can be changed into another prime (51981047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25990533 + 25990534.

It is an arithmetic number, because the mean of its divisors is an integer number (25990534).

Almost surely, 2^51981067 is an apocalyptic number.

51981067 is a deficient number, since it is larger than the sum of its proper divisors (1).

51981067 is an equidigital number, since it uses as much as digits as its factorization.

51981067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 51981067 is about 7209.7896640609. The cubic root of 51981067 is about 373.2058104176.

The spelling of 51981067 in words is "fifty-one million, nine hundred eighty-one thousand, sixty-seven".