121988413 has 16 divisors (see below), whose sum is σ = 134190000. Its totient is φ = 110380032.

The previous prime is 121988411. The next prime is 121988423. The reversal of 121988413 is 314889121.

It can be written as a sum of positive squares in 8 ways, for example, as 702244 + 121286169 = 838^2 + 11013^2 .

It is not a de Polignac number, because 121988413 - 2¹ = 121988411 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 (121988411) 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, 171703 + ... + 172411.

It is an arithmetic number, because the mean of its divisors is an integer number (8386875).

Almost surely, 2^121988413 is an apocalyptic number.

It is an amenable number.

121988413 is a deficient number, since it is larger than the sum of its proper divisors (12201587).

121988413 is a wasteful number, since it uses less digits than its factorization.

121988413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 13824, while the sum is 37.

The square root of 121988413 is about 11044.8364858879. The cubic root of 121988413 is about 495.9518643128.

The spelling of 121988413 in words is "one hundred twenty-one million, nine hundred eighty-eight thousand, four hundred thirteen".