121156564 has 6 divisors (see below), whose sum is σ = 212023994. Its totient is φ = 60578280.

The previous prime is 121156549. The next prime is 121156579. The reversal of 121156564 is 465651121.

It is an interprime number because it is at equal distance from previous prime (121156549) and next prime (121156579).

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 15272464 = 10290^2 + 3908^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15144567 + ... + 15144574.

Almost surely, 2^121156564 is an apocalyptic number.

It is an amenable number.

121156564 is a deficient number, since it is larger than the sum of its proper divisors (90867430).

121156564 is a wasteful number, since it uses less digits than its factorization.

121156564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30289145 (or 30289143 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 121156564 is about 11007.1142448873. The cubic root of 121156564 is about 494.8219799943.

It can be divided in two parts, 1211 and 56564, that added together give a palindrome (57775).

The spelling of 121156564 in words is "one hundred twenty-one million, one hundred fifty-six thousand, five hundred sixty-four".