191030031 has 6 divisors (see below), whose sum is σ = 275932280. Its totient is φ = 127353348.

The previous prime is 191030027. The next prime is 191030033. The reversal of 191030031 is 130030191.

It is not a de Polignac number, because 191030031 - 2² = 191030027 is a prime.

It is a super-2 number, since 2×191030031² = 72984945487721922, 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 = 191029986 and 191030013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191030033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10612771 + ... + 10612788.

Almost surely, 2^191030031 is an apocalyptic number.

191030031 is a deficient number, since it is larger than the sum of its proper divisors (84902249).

191030031 is a wasteful number, since it uses less digits than its factorization.

191030031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225565 (or 21225562 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 191030031 is about 13821.3614018301. The cubic root of 191030031 is about 575.9267032746.

The spelling of 191030031 in words is "one hundred ninety-one million, thirty thousand, thirty-one".