121264591 has 16 divisors (see below), whose sum is σ = 144138240. Its totient is φ = 99829440.

The previous prime is 121264513. The next prime is 121264657. The reversal of 121264591 is 195462121.

It is a cyclic number.

It is not a de Polignac number, because 121264591 - 2⁷ = 121264463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121264291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27690 + ... + 31768.

It is an arithmetic number, because the mean of its divisors is an integer number (9008640).

Almost surely, 2^121264591 is an apocalyptic number.

121264591 is a deficient number, since it is larger than the sum of its proper divisors (22873649).

121264591 is a wasteful number, since it uses less digits than its factorization.

121264591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254.

The product of its digits is 4320, while the sum is 31.

The square root of 121264591 is about 11012.0202960220. The cubic root of 121264591 is about 494.9690025823.

The spelling of 121264591 in words is "one hundred twenty-one million, two hundred sixty-four thousand, five hundred ninety-one".