123420151 has 4 divisors (see below), whose sum is σ = 125110912. Its totient is φ = 121729392.

The previous prime is 123420137. The next prime is 123420169. The reversal of 123420151 is 151024321.

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 123420151 - 2⁷ = 123420023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123423151) 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, 845271 + ... + 845416.

It is an arithmetic number, because the mean of its divisors is an integer number (31277728).

Almost surely, 2^123420151 is an apocalyptic number.

123420151 is a deficient number, since it is larger than the sum of its proper divisors (1690761).

123420151 is an equidigital number, since it uses as much as digits as its factorization.

123420151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690760.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 123420151 is about 11109.4622282089. The cubic root of 123420151 is about 497.8845974323.

Adding to 123420151 its reverse (151024321), we get a palindrome (274444472).

The spelling of 123420151 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred fifty-one".