51432049891 has 2 divisors, whose sum is σ = 51432049892. Its totient is φ = 51432049890.

The previous prime is 51432049861. The next prime is 51432049897. The reversal of 51432049891 is 19894023415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51432049891 - 2⁹ = 51432049379 is a prime.

It is a super-2 number, since 2×51432049891² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51432049897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25716024945 + 25716024946.

It is an arithmetic number, because the mean of its divisors is an integer number (25716024946).

Almost surely, 2^51432049891 is an apocalyptic number.

51432049891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51432049891 is an equidigital number, since it uses as much as digits as its factorization.

51432049891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 51432049891 in words is "fifty-one billion, four hundred thirty-two million, forty-nine thousand, eight hundred ninety-one".