51401891251 has 8 divisors (see below), whose sum is σ = 53645202720. Its totient is φ = 49159283712.

The previous prime is 51401891231. The next prime is 51401891273. The reversal of 51401891251 is 15219810415.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51401891251 - 2¹³ = 51401883059 is a prime.

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 51401891251.

It is not an unprimeable number, because it can be changed into a prime (51401891201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23950 + ... + 321523.

It is an arithmetic number, because the mean of its divisors is an integer number (6705650340).

Almost surely, 2^51401891251 is an apocalyptic number.

51401891251 is a deficient number, since it is larger than the sum of its proper divisors (2243311469).

51401891251 is a wasteful number, since it uses less digits than its factorization.

51401891251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351965.

The product of its (nonzero) digits is 14400, while the sum is 37.

The spelling of 51401891251 in words is "fifty-one billion, four hundred one million, eight hundred ninety-one thousand, two hundred fifty-one".