123801553 has 4 divisors (see below), whose sum is σ = 123824128. Its totient is φ = 123778980.

The previous prime is 123801547. The next prime is 123801589. The reversal of 123801553 is 355108321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355108321 = 53 ⋅6700157.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123801553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123801523) 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, 2800 + ... + 15982.

It is an arithmetic number, because the mean of its divisors is an integer number (30956032).

Almost surely, 2^123801553 is an apocalyptic number.

It is an amenable number.

123801553 is a deficient number, since it is larger than the sum of its proper divisors (22575).

123801553 is an equidigital number, since it uses as much as digits as its factorization.

123801553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22574.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 123801553 is about 11126.6146244040. The cubic root of 123801553 is about 498.3969365345.

Adding to 123801553 its reverse (355108321), we get a palindrome (478909874).

The spelling of 123801553 in words is "one hundred twenty-three million, eight hundred one thousand, five hundred fifty-three".