121523157 has 24 divisors (see below), whose sum is σ = 212412096. Its totient is φ = 65356416.

The previous prime is 121523063. The next prime is 121523167. The reversal of 121523157 is 751325121.

121523157 is a `hidden beast` number, since 121 + 523 + 15 + 7 = 666.

It is not a de Polignac number, because 121523157 - 2¹⁸ = 121261013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121523157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121523167) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 55663 + ... + 57804.

It is an arithmetic number, because the mean of its divisors is an integer number (8850504).

Almost surely, 2^121523157 is an apocalyptic number.

121523157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121523157 is a deficient number, since it is larger than the sum of its proper divisors (90888939).

121523157 is a wasteful number, since it uses less digits than its factorization.

121523157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113497 (or 113494 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 121523157 is about 11023.7542153297. The cubic root of 121523157 is about 495.3205514791.

Adding to 121523157 its reverse (751325121), we get a palindrome (872848278).

The spelling of 121523157 in words is "one hundred twenty-one million, five hundred twenty-three thousand, one hundred fifty-seven".