191862489031 has 2 divisors, whose sum is σ = 191862489032. Its totient is φ = 191862489030.

The previous prime is 191862489017. The next prime is 191862489037. The reversal of 191862489031 is 130984268191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191862489031 is a prime.

It is a super-2 number, since 2×191862489031² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191862489031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191862489037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95931244515 + 95931244516.

It is an arithmetic number, because the mean of its divisors is an integer number (95931244516).

Almost surely, 2^191862489031 is an apocalyptic number.

191862489031 is a deficient number, since it is larger than the sum of its proper divisors (1).

191862489031 is an equidigital number, since it uses as much as digits as its factorization.

191862489031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 191862489031 in words is "one hundred ninety-one billion, eight hundred sixty-two million, four hundred eighty-nine thousand, thirty-one".