121904651 has 6 divisors (see below), whose sum is σ = 133026852. Its totient is φ = 110789120.

The previous prime is 121904647. The next prime is 121904681. The reversal of 121904651 is 156409121.

It is not a de Polignac number, because 121904651 - 2² = 121904647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121904621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34955 + ... + 38283.

It is an arithmetic number, because the mean of its divisors is an integer number (22171142).

Almost surely, 2^121904651 is an apocalyptic number.

121904651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121904651 is a deficient number, since it is larger than the sum of its proper divisors (11122201).

121904651 is an frugal number, since it uses more digits than its factorization.

121904651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 121904651 is about 11041.0439270931. The cubic root of 121904651 is about 495.8383250272.

The spelling of 121904651 in words is "one hundred twenty-one million, nine hundred four thousand, six hundred fifty-one".