51420890111 has 4 divisors (see below), whose sum is σ = 51664591224. Its totient is φ = 51177189000.

The previous prime is 51420890107. The next prime is 51420890113. The reversal of 51420890111 is 11109802415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51420890111 - 2² = 51420890107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51420890113) 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, 121850240 + ... + 121850661.

It is an arithmetic number, because the mean of its divisors is an integer number (12916147806).

Almost surely, 2^51420890111 is an apocalyptic number.

51420890111 is a deficient number, since it is larger than the sum of its proper divisors (243701113).

51420890111 is a wasteful number, since it uses less digits than its factorization.

51420890111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243701112.

The product of its (nonzero) digits is 2880, while the sum is 32.

The spelling of 51420890111 in words is "fifty-one billion, four hundred twenty million, eight hundred ninety thousand, one hundred eleven".