121651790 has 32 divisors (see below), whose sum is σ = 237305376. Its totient is φ = 44634240.

The previous prime is 121651769. The next prime is 121651811. The reversal of 121651790 is 97156121.

It is an interprime number because it is at equal distance from previous prime (121651769) and next prime (121651811).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18320 + ... + 24060.

It is an arithmetic number, because the mean of its divisors is an integer number (7415793).

Almost surely, 2^121651790 is an apocalyptic number.

121651790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121651790 is a deficient number, since it is larger than the sum of its proper divisors (115653586).

121651790 is a wasteful number, since it uses less digits than its factorization.

121651790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5924.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 121651790 is about 11029.5870276271. The cubic root of 121651790 is about 495.4952564558.

The spelling of 121651790 in words is "one hundred twenty-one million, six hundred fifty-one thousand, seven hundred ninety".