121603623 has 4 divisors (see below), whose sum is σ = 162138168. Its totient is φ = 81069080.

The previous prime is 121603609. The next prime is 121603679. The reversal of 121603623 is 326306121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121603623 is a prime.

It is a super-2 number, since 2×121603623² = 29574882253452258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121603593 and 121603602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121603693) 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, 20267268 + ... + 20267273.

It is an arithmetic number, because the mean of its divisors is an integer number (40534542).

Almost surely, 2^121603623 is an apocalyptic number.

121603623 is a deficient number, since it is larger than the sum of its proper divisors (40534545).

121603623 is an equidigital number, since it uses as much as digits as its factorization.

121603623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40534544.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 121603623 is about 11027.4032754770. The cubic root of 121603623 is about 495.4298521007.

Adding to 121603623 its reverse (326306121), we get a palindrome (447909744).

The spelling of 121603623 in words is "one hundred twenty-one million, six hundred three thousand, six hundred twenty-three".