121634557 has 12 divisors (see below), whose sum is σ = 138718944. Its totient is φ = 105764120.

The previous prime is 121634551. The next prime is 121634563. The reversal of 121634557 is 755436121.

It is an interprime number because it is at equal distance from previous prime (121634551) and next prime (121634563).

It is a de Polignac number, because none of the positive numbers 2^k-121634557 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121634551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4633 + ... + 16270.

It is an arithmetic number, because the mean of its divisors is an integer number (11559912).

Almost surely, 2^121634557 is an apocalyptic number.

It is an amenable number.

121634557 is a deficient number, since it is larger than the sum of its proper divisors (17084387).

121634557 is a wasteful number, since it uses less digits than its factorization.

121634557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20960 (or 20937 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 121634557 is about 11028.8057830392. The cubic root of 121634557 is about 495.4718583264.

The spelling of 121634557 in words is "one hundred twenty-one million, six hundred thirty-four thousand, five hundred fifty-seven".