121115590 has 16 divisors (see below), whose sum is σ = 219454560. Its totient is φ = 48124800.

The previous prime is 121115587. The next prime is 121115593. The reversal of 121115590 is 95511121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121115587) and next prime (121115593).

It is a super-2 number, since 2×121115590² = 29337972282096200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121115593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38595 + ... + 41614.

It is an arithmetic number, because the mean of its divisors is an integer number (13715910).

Almost surely, 2^121115590 is an apocalyptic number.

121115590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121115590 is a deficient number, since it is larger than the sum of its proper divisors (98338970).

121115590 is a wasteful number, since it uses less digits than its factorization.

121115590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80367.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 121115590 is about 11005.2528367139. The cubic root of 121115590 is about 494.7661923392.

The spelling of 121115590 in words is "one hundred twenty-one million, one hundred fifteen thousand, five hundred ninety".