121651257 has 48 divisors (see below), whose sum is σ = 205231488. Its totient is φ = 62415360.

The previous prime is 121651253. The next prime is 121651261. The reversal of 121651257 is 752156121.

It is an interprime number because it is at equal distance from previous prime (121651253) and next prime (121651261).

It is not a de Polignac number, because 121651257 - 2² = 121651253 is a prime.

Its product of digits (4200) is a multiple of the sum of its prime factors (350).

It is not an unprimeable number, because it can be changed into a prime (121651253) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 504657 + ... + 504897.

It is an arithmetic number, because the mean of its divisors is an integer number (4275656).

Almost surely, 2^121651257 is an apocalyptic number.

It is an amenable number.

121651257 is a deficient number, since it is larger than the sum of its proper divisors (83580231).

121651257 is a wasteful number, since it uses less digits than its factorization.

121651257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 307 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 121651257 is about 11029.5628653179. The cubic root of 121651257 is about 495.4945328075.

The spelling of 121651257 in words is "one hundred twenty-one million, six hundred fifty-one thousand, two hundred fifty-seven".