197918437831 has 2 divisors, whose sum is σ = 197918437832. Its totient is φ = 197918437830.

The previous prime is 197918437819. The next prime is 197918437883. The reversal of 197918437831 is 138734819791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197918437831 - 2¹¹ = 197918435783 is a prime.

It is a super-2 number, since 2×197918437831² (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 197918437831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197918431831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98959218915 + 98959218916.

It is an arithmetic number, because the mean of its divisors is an integer number (98959218916).

Almost surely, 2^197918437831 is an apocalyptic number.

197918437831 is a deficient number, since it is larger than the sum of its proper divisors (1).

197918437831 is an equidigital number, since it uses as much as digits as its factorization.

197918437831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 61.

The spelling of 197918437831 in words is "one hundred ninety-seven billion, nine hundred eighteen million, four hundred thirty-seven thousand, eight hundred thirty-one".