121136639 has 8 divisors (see below), whose sum is σ = 131186160. Its totient is φ = 111191616.

The previous prime is 121136621. The next prime is 121136651. The reversal of 121136639 is 936631121.

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 121136639 - 2⁸ = 121136383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121136669) 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, 23702 + ... + 28355.

It is an arithmetic number, because the mean of its divisors is an integer number (16398270).

Almost surely, 2^121136639 is an apocalyptic number.

121136639 is a deficient number, since it is larger than the sum of its proper divisors (10049521).

121136639 is a wasteful number, since it uses less digits than its factorization.

121136639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52249.

The product of its digits is 5832, while the sum is 32.

The square root of 121136639 is about 11006.2091112244. The cubic root of 121136639 is about 494.7948529224.

The spelling of 121136639 in words is "one hundred twenty-one million, one hundred thirty-six thousand, six hundred thirty-nine".