51015014987 has 4 divisors (see below), whose sum is σ = 51491790936. Its totient is φ = 50538239040.

The previous prime is 51015014977. The next prime is 51015015031. The reversal of 51015014987 is 78941051015.

It is a happy number.

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 51015014987 - 2¹⁶ = 51014949451 is a prime.

It is a super-2 number, since 2×51015014987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51015014977) 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, 238387814 + ... + 238388027.

It is an arithmetic number, because the mean of its divisors is an integer number (12872947734).

Almost surely, 2^51015014987 is an apocalyptic number.

51015014987 is a deficient number, since it is larger than the sum of its proper divisors (476775949).

51015014987 is a wasteful number, since it uses less digits than its factorization.

51015014987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476775948.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 51015014987 in words is "fifty-one billion, fifteen million, fourteen thousand, nine hundred eighty-seven".