191036952397 has 2 divisors, whose sum is σ = 191036952398. Its totient is φ = 191036952396.

The previous prime is 191036952391. The next prime is 191036952401. The reversal of 191036952397 is 793259630191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110618768836 + 80418183561 = 332594^2 + 283581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191036952397 is a prime.

It is a super-2 number, since 2×191036952397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191036952391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95518476198 + 95518476199.

It is an arithmetic number, because the mean of its divisors is an integer number (95518476199).

Almost surely, 2^191036952397 is an apocalyptic number.

It is an amenable number.

191036952397 is a deficient number, since it is larger than the sum of its proper divisors (1).

191036952397 is an equidigital number, since it uses as much as digits as its factorization.

191036952397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2755620, while the sum is 55.

The spelling of 191036952397 in words is "one hundred ninety-one billion, thirty-six million, nine hundred fifty-two thousand, three hundred ninety-seven".