191356523131 has 4 divisors (see below), whose sum is σ = 191522488312. Its totient is φ = 191190557952.

The previous prime is 191356523101. The next prime is 191356523153. The reversal of 191356523131 is 131325653191.

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 191356523131 - 2²⁷ = 191222305403 is a prime.

It is a super-2 number, since 2×191356523131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191356523101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82980861 + ... + 82983166.

It is an arithmetic number, because the mean of its divisors is an integer number (47880622078).

Almost surely, 2^191356523131 is an apocalyptic number.

191356523131 is a deficient number, since it is larger than the sum of its proper divisors (165965181).

191356523131 is a wasteful number, since it uses less digits than its factorization.

191356523131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165965180.

The product of its digits is 72900, while the sum is 40.

The spelling of 191356523131 in words is "one hundred ninety-one billion, three hundred fifty-six million, five hundred twenty-three thousand, one hundred thirty-one".