121199931 has 6 divisors (see below), whose sum is σ = 175066580. Its totient is φ = 80799948.

The previous prime is 121199921. The next prime is 121199941. The reversal of 121199931 is 139991121.

It is an interprime number because it is at equal distance from previous prime (121199921) and next prime (121199941).

It is not a de Polignac number, because 121199931 - 2⁶ = 121199867 is a prime.

It is a super-2 number, since 2×121199931² = 29378846548809522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121199921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6733321 + ... + 6733338.

Almost surely, 2^121199931 is an apocalyptic number.

121199931 is a deficient number, since it is larger than the sum of its proper divisors (53866649).

121199931 is a wasteful number, since it uses less digits than its factorization.

121199931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13466665 (or 13466662 counting only the distinct ones).

The product of its digits is 4374, while the sum is 36.

The square root of 121199931 is about 11009.0840218431. The cubic root of 121199931 is about 494.8810121102.

The spelling of 121199931 in words is "one hundred twenty-one million, one hundred ninety-nine thousand, nine hundred thirty-one".