121137639 has 16 divisors (see below), whose sum is σ = 184787712. Its totient is φ = 69147648.

The previous prime is 121137637. The next prime is 121137649. The reversal of 121137639 is 936731121.

It is not a de Polignac number, because 121137639 - 2¹ = 121137637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121137637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21712 + ... + 26714.

It is an arithmetic number, because the mean of its divisors is an integer number (11549232).

Almost surely, 2^121137639 is an apocalyptic number.

121137639 is a deficient number, since it is larger than the sum of its proper divisors (63650073).

121137639 is a wasteful number, since it uses less digits than its factorization.

121137639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6166.

The product of its digits is 6804, while the sum is 33.

The square root of 121137639 is about 11006.2545400331. The cubic root of 121137639 is about 494.7962144524.

The spelling of 121137639 in words is "one hundred twenty-one million, one hundred thirty-seven thousand, six hundred thirty-nine".