51040220401 has 4 divisors (see below), whose sum is σ = 51041680704. Its totient is φ = 51038760100.

The previous prime is 51040220359. The next prime is 51040220411. The reversal of 51040220401 is 10402204015.

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 51040220401 - 2⁹ = 51040219889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51040220411) 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, 676405 + ... + 748066.

It is an arithmetic number, because the mean of its divisors is an integer number (12760420176).

Almost surely, 2^51040220401 is an apocalyptic number.

It is an amenable number.

51040220401 is a deficient number, since it is larger than the sum of its proper divisors (1460303).

51040220401 is a wasteful number, since it uses less digits than its factorization.

51040220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460302.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 51040220401 its reverse (10402204015), we get a palindrome (61442424416).

It can be divided in two parts, 51040 and 220401, that added together give a square (271441 = 521²).

The spelling of 51040220401 in words is "fifty-one billion, forty million, two hundred twenty thousand, four hundred one".