121185647 has 8 divisors (see below), whose sum is σ = 134176512. Its totient is φ = 108523800.

The previous prime is 121185641. The next prime is 121185661. The reversal of 121185647 is 746581121.

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

It is not a de Polignac number, because 121185647 - 2¹⁸ = 120923503 is a prime.

It is a super-2 number, since 2×121185647² = 29371922077617218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121185641) 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, 81479 + ... + 82952.

It is an arithmetic number, because the mean of its divisors is an integer number (16772064).

Almost surely, 2^121185647 is an apocalyptic number.

121185647 is a deficient number, since it is larger than the sum of its proper divisors (12990865).

121185647 is a wasteful number, since it uses less digits than its factorization.

121185647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164509.

The product of its digits is 13440, while the sum is 35.

The square root of 121185647 is about 11008.4352657405. The cubic root of 121185647 is about 494.8615699701.

The spelling of 121185647 in words is "one hundred twenty-one million, one hundred eighty-five thousand, six hundred forty-seven".