51224390761 has 4 divisors (see below), whose sum is σ = 51227419024. Its totient is φ = 51221362500.

The previous prime is 51224390753. The next prime is 51224390779. The reversal of 51224390761 is 16709342215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51224390761 - 2³ = 51224390753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51224390561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1488615 + ... + 1522636.

It is an arithmetic number, because the mean of its divisors is an integer number (12806854756).

Almost surely, 2^51224390761 is an apocalyptic number.

It is an amenable number.

51224390761 is a deficient number, since it is larger than the sum of its proper divisors (3028263).

51224390761 is a wasteful number, since it uses less digits than its factorization.

51224390761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028262.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 51224390761 in words is "fifty-one billion, two hundred twenty-four million, three hundred ninety thousand, seven hundred sixty-one".