121655131 has 8 divisors (see below), whose sum is σ = 131105520. Its totient is φ = 112217952.

The previous prime is 121655123. The next prime is 121655141. The reversal of 121655131 is 131556121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121655131 - 2³ = 121655123 is a prime.

It is a super-2 number, since 2×121655131² = 29599941797254322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121655096 and 121655105.

It is not an unprimeable number, because it can be changed into a prime (121655101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24636 + ... + 29158.

It is an arithmetic number, because the mean of its divisors is an integer number (16388190).

Almost surely, 2^121655131 is an apocalyptic number.

121655131 is a deficient number, since it is larger than the sum of its proper divisors (9450389).

121655131 is a wasteful number, since it uses less digits than its factorization.

121655131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6605.

The product of its digits is 900, while the sum is 25.

The square root of 121655131 is about 11029.7384828472. The cubic root of 121655131 is about 495.4997924474.

The spelling of 121655131 in words is "one hundred twenty-one million, six hundred fifty-five thousand, one hundred thirty-one".