121939631 has 8 divisors (see below), whose sum is σ = 133110864. Its totient is φ = 110782720.

The previous prime is 121939627. The next prime is 121939639. The reversal of 121939631 is 136939121.

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 121939631 - 2² = 121939627 is a prime.

It is a super-2 number, since 2×121939631² = 29738547216832322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121939591 and 121939600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121939639) 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, 22565 + ... + 27441.

It is an arithmetic number, because the mean of its divisors is an integer number (16638858).

Almost surely, 2^121939631 is an apocalyptic number.

121939631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121939631 is a deficient number, since it is larger than the sum of its proper divisors (11171233).

121939631 is a wasteful number, since it uses less digits than its factorization.

121939631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7161.

The product of its digits is 8748, while the sum is 35.

The square root of 121939631 is about 11042.6279028137. The cubic root of 121939631 is about 495.8857466959.

The spelling of 121939631 in words is "one hundred twenty-one million, nine hundred thirty-nine thousand, six hundred thirty-one".