121557125 has 16 divisors (see below), whose sum is σ = 156939120. Its totient is φ = 93889600.

The previous prime is 121557119. The next prime is 121557131. The reversal of 121557125 is 521755121.

It is an interprime number because it is at equal distance from previous prime (121557119) and next prime (121557131).

It can be written as a sum of positive squares in 8 ways, for example, as 21836929 + 99720196 = 4673^2 + 9986^2 .

It is not a de Polignac number, because 121557125 - 2¹⁰ = 121556101 is a prime.

It is a super-3 number, since 3×121557125³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13142 + ... + 20391.

It is an arithmetic number, because the mean of its divisors is an integer number (9808695).

Almost surely, 2^121557125 is an apocalyptic number.

It is an amenable number.

121557125 is a deficient number, since it is larger than the sum of its proper divisors (35381995).

121557125 is an equidigital number, since it uses as much as digits as its factorization.

121557125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33577 (or 33567 counting only the distinct ones).

The product of its digits is 3500, while the sum is 29.

The square root of 121557125 is about 11025.2947806397. The cubic root of 121557125 is about 495.3666976390.

The spelling of 121557125 in words is "one hundred twenty-one million, five hundred fifty-seven thousand, one hundred twenty-five".