51245501401 has 4 divisors (see below), whose sum is σ = 51246069732. Its totient is φ = 51244933072.

The previous prime is 51245501393. The next prime is 51245501423. The reversal of 51245501401 is 10410554215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47197997001 + 4047504400 = 217251^2 + 63620^2 .

It is a cyclic number.

It is not a de Polignac number, because 51245501401 - 2³ = 51245501393 is a prime.

It is a super-2 number, since 2×51245501401² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51245501401.

It is not an unprimeable number, because it can be changed into a prime (51245501431) 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, 115570 + ... + 340363.

It is an arithmetic number, because the mean of its divisors is an integer number (12811517433).

Almost surely, 2^51245501401 is an apocalyptic number.

It is an amenable number.

51245501401 is a deficient number, since it is larger than the sum of its proper divisors (568331).

51245501401 is a wasteful number, since it uses less digits than its factorization.

51245501401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568330.

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 51245501401 in words is "fifty-one billion, two hundred forty-five million, five hundred one thousand, four hundred one".