1997190131 has 2 divisors, whose sum is σ = 1997190132. Its totient is φ = 1997190130.

The previous prime is 1997190121. The next prime is 1997190161. The reversal of 1997190131 is 1310917991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997190131 is a prime.

It is a super-2 number, since 2×1997190131² = 7977536838727594322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1997190121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998595065 + 998595066.

It is an arithmetic number, because the mean of its divisors is an integer number (998595066).

Almost surely, 2^1997190131 is an apocalyptic number.

1997190131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997190131 is an equidigital number, since it uses as much as digits as its factorization.

1997190131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 41.

The square root of 1997190131 is about 44689.9332176722. The cubic root of 1997190131 is about 1259.3307378418.

The spelling of 1997190131 in words is "one billion, nine hundred ninety-seven million, one hundred ninety thousand, one hundred thirty-one".