121571613 has 6 divisors (see below), whose sum is σ = 175603454. Its totient is φ = 81047736.

The previous prime is 121571561. The next prime is 121571617. The reversal of 121571613 is 316175121.

It can be written as a sum of positive squares in only one way, i.e., 64689849 + 56881764 = 8043^2 + 7542^2 .

It is not a de Polignac number, because 121571613 - 2⁸ = 121571357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121571617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6753970 + ... + 6753987.

Almost surely, 2^121571613 is an apocalyptic number.

It is an amenable number.

121571613 is a deficient number, since it is larger than the sum of its proper divisors (54031841).

121571613 is a wasteful number, since it uses less digits than its factorization.

121571613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13507963 (or 13507960 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 121571613 is about 11025.9517956501. The cubic root of 121571613 is about 495.3863772412.

The spelling of 121571613 in words is "one hundred twenty-one million, five hundred seventy-one thousand, six hundred thirteen".