196431240128531 has 2 divisors, whose sum is σ = 196431240128532. Its totient is φ = 196431240128530.

The previous prime is 196431240128429. The next prime is 196431240128579. The reversal of 196431240128531 is 135821042134691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196431240128531 - 2¹⁸ = 196431239866387 is a prime.

It is a super-2 number, since 2×196431240128531² (a number of 29 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 196431240128531.

It is not a weakly prime, because it can be changed into another prime (196431240128131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98215620064265 + 98215620064266.

It is an arithmetic number, because the mean of its divisors is an integer number (98215620064266).

Almost surely, 2^{196431240128531} is an apocalyptic number.

196431240128531 is a deficient number, since it is larger than the sum of its proper divisors (1).

196431240128531 is an equidigital number, since it uses as much as digits as its factorization.

196431240128531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 196431240128531 in words is "one hundred ninety-six trillion, four hundred thirty-one billion, two hundred forty million, one hundred twenty-eight thousand, five hundred thirty-one".