121531125 has 64 divisors (see below), whose sum is σ = 219098880. Its totient is φ = 59616000.

The previous prime is 121531117. The next prime is 121531127. The reversal of 121531125 is 521135121.

It is not a de Polignac number, because 121531125 - 2³ = 121531117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 263395 + ... + 263855.

It is an arithmetic number, because the mean of its divisors is an integer number (3423420).

Almost surely, 2^121531125 is an apocalyptic number.

121531125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121531125 is a deficient number, since it is larger than the sum of its proper divisors (97567755).

121531125 is a wasteful number, since it uses less digits than its factorization.

121531125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 525 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 121531125 is about 11024.1156107871. The cubic root of 121531125 is about 495.3313769272.

Adding to 121531125 its reverse (521135121), we get a palindrome (642666246).

The spelling of 121531125 in words is "one hundred twenty-one million, five hundred thirty-one thousand, one hundred twenty-five".