199698145931 has 4 divisors (see below), whose sum is σ = 199699320264. Its totient is φ = 199696971600.

The previous prime is 199698145873. The next prime is 199698145949. The reversal of 199698145931 is 139541896991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 199698145931 - 2¹⁸ = 199697883787 is a prime.

It is a super-2 number, since 2×199698145931² (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 (199698145331) 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, 277730 + ... + 690311.

It is an arithmetic number, because the mean of its divisors is an integer number (49924830066).

Almost surely, 2^199698145931 is an apocalyptic number.

199698145931 is a deficient number, since it is larger than the sum of its proper divisors (1174333).

199698145931 is an equidigital number, since it uses as much as digits as its factorization.

199698145931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174332.

The product of its digits is 18895680, while the sum is 65.

The spelling of 199698145931 in words is "one hundred ninety-nine billion, six hundred ninety-eight million, one hundred forty-five thousand, nine hundred thirty-one".