1231254051 has 4 divisors (see below), whose sum is σ = 1641672072. Its totient is φ = 820836032.

The previous prime is 1231254049. The next prime is 1231254061. The reversal of 1231254051 is 1504521321.

It is a happy number.

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 1231254051 - 2¹ = 1231254049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231254061) 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, 205209006 + ... + 205209011.

It is an arithmetic number, because the mean of its divisors is an integer number (410418018).

Almost surely, 2^1231254051 is an apocalyptic number.

1231254051 is a deficient number, since it is larger than the sum of its proper divisors (410418021).

1231254051 is an equidigital number, since it uses as much as digits as its factorization.

1231254051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410418020.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1231254051 is about 35089.2298433579. The cubic root of 1231254051 is about 1071.8052766327.

Adding to 1231254051 its reverse (1504521321), we get a palindrome (2735775372).

The spelling of 1231254051 in words is "one billion, two hundred thirty-one million, two hundred fifty-four thousand, fifty-one".