51209353967 has 2 divisors, whose sum is σ = 51209353968. Its totient is φ = 51209353966.

The previous prime is 51209353883. The next prime is 51209354029. The reversal of 51209353967 is 76935390215.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51209353967 - 2²⁴ = 51192576751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51209353067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25604676983 + 25604676984.

It is an arithmetic number, because the mean of its divisors is an integer number (25604676984).

Almost surely, 2^51209353967 is an apocalyptic number.

51209353967 is a deficient number, since it is larger than the sum of its proper divisors (1).

51209353967 is an equidigital number, since it uses as much as digits as its factorization.

51209353967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1530900, while the sum is 50.

The spelling of 51209353967 in words is "fifty-one billion, two hundred nine million, three hundred fifty-three thousand, nine hundred sixty-seven".