121642625 has 16 divisors (see below), whose sum is σ = 163489872. Its totient is φ = 89827200.

The previous prime is 121642621. The next prime is 121642637. The reversal of 121642625 is 526246121.

It can be written as a sum of positive squares in 8 ways, for example, as 91623184 + 30019441 = 9572^2 + 5479^2 .

It is not a de Polignac number, because 121642625 - 2² = 121642621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121642621) 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, 35804 + ... + 39053.

It is an arithmetic number, because the mean of its divisors is an integer number (10218117).

Almost surely, 2^121642625 is an apocalyptic number.

It is an amenable number.

121642625 is a deficient number, since it is larger than the sum of its proper divisors (41847247).

121642625 is an equidigital number, since it uses as much as digits as its factorization.

121642625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74885 (or 74875 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 121642625 is about 11029.1715464037. The cubic root of 121642625 is about 495.4828129396.

Adding to 121642625 its reverse (526246121), we get a palindrome (647888746).

The spelling of 121642625 in words is "one hundred twenty-one million, six hundred forty-two thousand, six hundred twenty-five".