5181691031 has 4 divisors (see below), whose sum is σ = 5652753864. Its totient is φ = 4710628200.

The previous prime is 5181691027. The next prime is 5181691063. The reversal of 5181691031 is 1301961815.

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 5181691031 - 2² = 5181691027 is a prime.

It is a super-2 number, since 2×5181691031² = 53699843881491685922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5181690982 and 5181691000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181691231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235531400 + ... + 235531421.

It is an arithmetic number, because the mean of its divisors is an integer number (1413188466).

Almost surely, 2^5181691031 is an apocalyptic number.

5181691031 is a deficient number, since it is larger than the sum of its proper divisors (471062833).

5181691031 is a wasteful number, since it uses less digits than its factorization.

5181691031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471062832.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 5181691031 is about 71983.9637072036. The cubic root of 5181691031 is about 1730.4424933130.

The spelling of 5181691031 in words is "five billion, one hundred eighty-one million, six hundred ninety-one thousand, thirty-one".