121625638 has 4 divisors (see below), whose sum is σ = 182438460. Its totient is φ = 60812818.

The previous prime is 121625611. The next prime is 121625641. The reversal of 121625638 is 836526121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30406408 + ... + 30406411.

It is an arithmetic number, because the mean of its divisors is an integer number (45609615).

Almost surely, 2^121625638 is an apocalyptic number.

121625638 is a deficient number, since it is larger than the sum of its proper divisors (60812822).

121625638 is an equidigital number, since it uses as much as digits as its factorization.

121625638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60812821.

The product of its digits is 17280, while the sum is 34.

The square root of 121625638 is about 11028.4014254107. The cubic root of 121625638 is about 495.4597476740.

The spelling of 121625638 in words is "one hundred twenty-one million, six hundred twenty-five thousand, six hundred thirty-eight".