7811138051 has 16 divisors (see below), whose sum is σ = 8369706240. Its totient is φ = 7268355360.

The previous prime is 7811138047. The next prime is 7811138057. The reversal of 7811138051 is 1508311187.

It is a cyclic number.

It is not a de Polignac number, because 7811138051 - 2² = 7811138047 is a prime.

It is a super-2 number, since 2×7811138051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7811138057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258506 + ... + 287136.

It is an arithmetic number, because the mean of its divisors is an integer number (523106640).

Almost surely, 2^7811138051 is an apocalyptic number.

7811138051 is a deficient number, since it is larger than the sum of its proper divisors (558568189).

7811138051 is a wasteful number, since it uses less digits than its factorization.

7811138051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28906.

The product of its (nonzero) digits is 6720, while the sum is 35.

The square root of 7811138051 is about 88380.6429655272. The cubic root of 7811138051 is about 1984.1360037646.

The spelling of 7811138051 in words is "seven billion, eight hundred eleven million, one hundred thirty-eight thousand, fifty-one".