121788623 has 4 divisors (see below), whose sum is σ = 132860328. Its totient is φ = 110716920.

The previous prime is 121788593. The next prime is 121788631. The reversal of 121788623 is 326887121.

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

It is a cyclic number.

It is not a de Polignac number, because 121788623 - 2¹² = 121784527 is a prime.

It is a super-2 number, since 2×121788623² = 29664937384472258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121788523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5535836 + ... + 5535857.

It is an arithmetic number, because the mean of its divisors is an integer number (33215082).

Almost surely, 2^121788623 is an apocalyptic number.

121788623 is a deficient number, since it is larger than the sum of its proper divisors (11071705).

121788623 is a wasteful number, since it uses less digits than its factorization.

121788623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11071704.

The product of its digits is 32256, while the sum is 38.

The square root of 121788623 is about 11035.7882817676. The cubic root of 121788623 is about 495.6809632669.

The spelling of 121788623 in words is "one hundred twenty-one million, seven hundred eighty-eight thousand, six hundred twenty-three".