121556057 has 8 divisors (see below), whose sum is σ = 139842432. Its totient is φ = 103500000.

The previous prime is 121556051. The next prime is 121556089. The reversal of 121556057 is 750655121.

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 121556057 - 2⁴ = 121556041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121556051) 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, 56444 + ... + 58557.

It is an arithmetic number, because the mean of its divisors is an integer number (17480304).

Almost surely, 2^121556057 is an apocalyptic number.

It is an amenable number.

121556057 is a deficient number, since it is larger than the sum of its proper divisors (18286375).

121556057 is a wasteful number, since it uses less digits than its factorization.

121556057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115159.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 121556057 is about 11025.2463464541. The cubic root of 121556057 is about 495.3652468720.

The spelling of 121556057 in words is "one hundred twenty-one million, five hundred fifty-six thousand, fifty-seven".