121590992601 has 27 divisors (see below), whose sum is σ = 190202056317. Its totient is φ = 74816857440.

The previous prime is 121590992533. The next prime is 121590992603. The reversal of 121590992601 is 106299095121.

The square root of 121590992601 is 348699.

It is a perfect power (a square), and thus also a powerful number.

121590992601 is a `hidden beast` number, since 1 + 215 + 90 + 99 + 260 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6246531225 + 115344461376 = 79035^2 + 339624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-121590992601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121590992603) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 13594791 + ... + 13603731.

Almost surely, 2^121590992601 is an apocalyptic number.

121590992601 is the 348699-th square number.

121590992601 is the 174350-th centered octagonal number.

It is an amenable number.

121590992601 is a deficient number, since it is larger than the sum of its proper divisors (68611063716).

121590992601 is an frugal number, since it uses more digits than its factorization.

121590992601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17914 (or 8957 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 121590992601 in words is "one hundred twenty-one billion, five hundred ninety million, nine hundred ninety-two thousand, six hundred one".