121523623 has 16 divisors (see below), whose sum is σ = 135023616. Its totient is φ = 108666720.

The previous prime is 121523617. The next prime is 121523629. The reversal of 121523623 is 326325121.

It is an interprime number because it is at equal distance from previous prime (121523617) and next prime (121523629).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121523623 is a prime.

It is a super-2 number, since 2×121523623² = 29535981894092258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121523629) 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 15 ways as a sum of consecutive naturals, for example, 61968 + ... + 63898.

It is an arithmetic number, because the mean of its divisors is an integer number (8438976).

Almost surely, 2^121523623 is an apocalyptic number.

121523623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121523623 is a deficient number, since it is larger than the sum of its proper divisors (13499993).

121523623 is a wasteful number, since it uses less digits than its factorization.

121523623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094.

The product of its digits is 2160, while the sum is 25.

The square root of 121523623 is about 11023.7753514846. The cubic root of 121523623 is about 495.3211846069.

Adding to 121523623 its reverse (326325121), we get a palindrome (447848744).

The spelling of 121523623 in words is "one hundred twenty-one million, five hundred twenty-three thousand, six hundred twenty-three".