123455251 has 4 divisors (see below), whose sum is σ = 124194672. Its totient is φ = 122715832.

The previous prime is 123455243. The next prime is 123455261. The reversal of 123455251 is 152554321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152554321 = 4583 ⋅33287.

It is a cyclic number.

It is not a de Polignac number, because 123455251 - 2³ = 123455243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123455231) 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, 369460 + ... + 369793.

It is an arithmetic number, because the mean of its divisors is an integer number (31048668).

Almost surely, 2^123455251 is an apocalyptic number.

123455251 is a deficient number, since it is larger than the sum of its proper divisors (739421).

123455251 is an equidigital number, since it uses as much as digits as its factorization.

123455251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739420.

The product of its digits is 6000, while the sum is 28.

The square root of 123455251 is about 11111.0418503397. The cubic root of 123455251 is about 497.9317914894.

The spelling of 123455251 in words is "one hundred twenty-three million, four hundred fifty-five thousand, two hundred fifty-one".