1531023191 has 2 divisors, whose sum is σ = 1531023192. Its totient is φ = 1531023190.

The previous prime is 1531023163. The next prime is 1531023199. The reversal of 1531023191 is 1913201351.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531023191 is a prime.

It is a super-2 number, since 2×1531023191² = 4688064022759644962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1531023191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531023199) 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 as a sum of consecutive naturals, namely, 765511595 + 765511596.

It is an arithmetic number, because the mean of its divisors is an integer number (765511596).

Almost surely, 2^1531023191 is an apocalyptic number.

1531023191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531023191 is an equidigital number, since it uses as much as digits as its factorization.

1531023191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 1531023191 is about 39128.2914398265. The cubic root of 1531023191 is about 1152.5521619899.

The spelling of 1531023191 in words is "one billion, five hundred thirty-one million, twenty-three thousand, one hundred ninety-one".