1231274309 has 4 divisors (see below), whose sum is σ = 1296078240. Its totient is φ = 1166470380.

The previous prime is 1231274293. The next prime is 1231274333. The reversal of 1231274309 is 9034721321.

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.

It is a cyclic number.

It is not a de Polignac number, because 1231274309 - 2⁴ = 1231274293 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 (1231274509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32401937 + ... + 32401974.

It is an arithmetic number, because the mean of its divisors is an integer number (324019560).

Almost surely, 2^1231274309 is an apocalyptic number.

1231274309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1231274309 is a deficient number, since it is larger than the sum of its proper divisors (64803931).

1231274309 is an equidigital number, since it uses as much as digits as its factorization.

1231274309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64803930.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1231274309 is about 35089.5185062434. The cubic root of 1231274309 is about 1071.8111547893.

The spelling of 1231274309 in words is "one billion, two hundred thirty-one million, two hundred seventy-four thousand, three hundred nine".