121551597 has 20 divisors (see below), whose sum is σ = 182397820. Its totient is φ = 80668224.

The previous prime is 121551559. The next prime is 121551629. The reversal of 121551597 is 795155121.

121551597 is a `hidden beast` number, since 1 + 2 + 15 + 51 + 597 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81974916 + 39576681 = 9054^2 + 6291^2 .

It is not a de Polignac number, because 121551597 - 2¹⁴ = 121535213 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 (121551517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15273 + ... + 21825.

It is an arithmetic number, because the mean of its divisors is an integer number (9119891).

Almost surely, 2^121551597 is an apocalyptic number.

It is an amenable number.

121551597 is a deficient number, since it is larger than the sum of its proper divisors (60846223).

121551597 is an equidigital number, since it uses as much as digits as its factorization.

121551597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6794 (or 6785 counting only the distinct ones).

The product of its digits is 15750, while the sum is 36.

The square root of 121551597 is about 11025.0440815445. The cubic root of 121551597 is about 495.3591883339.

The spelling of 121551597 in words is "one hundred twenty-one million, five hundred fifty-one thousand, five hundred ninety-seven".