1230420251 has 4 divisors (see below), whose sum is σ = 1239812904. Its totient is φ = 1221027600.

The previous prime is 1230420229. The next prime is 1230420253. The reversal of 1230420251 is 1520240321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1520240321 = 409 ⋅3716969.

It is a cyclic number.

It is not a de Polignac number, because 1230420251 - 2⁶ = 1230420187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230420253) 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, 4696130 + ... + 4696391.

It is an arithmetic number, because the mean of its divisors is an integer number (309953226).

Almost surely, 2^1230420251 is an apocalyptic number.

1230420251 is a deficient number, since it is larger than the sum of its proper divisors (9392653).

1230420251 is an equidigital number, since it uses as much as digits as its factorization.

1230420251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9392652.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1230420251 is about 35077.3466927018. The cubic root of 1230420251 is about 1071.5632813421.

Adding to 1230420251 its reverse (1520240321), we get a palindrome (2750660572).

The spelling of 1230420251 in words is "one billion, two hundred thirty million, four hundred twenty thousand, two hundred fifty-one".