1231349965 has 32 divisors (see below), whose sum is σ = 1575542016. Its totient is φ = 921845760.

The previous prime is 1231349909. The next prime is 1231349969. The reversal of 1231349965 is 5699431321.

It is a happy number.

It is not a de Polignac number, because 1231349965 - 2²⁷ = 1097132237 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 (1231349969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1802514 + ... + 1803196.

It is an arithmetic number, because the mean of its divisors is an integer number (49235688).

Almost surely, 2^1231349965 is an apocalyptic number.

It is an amenable number.

1231349965 is a deficient number, since it is larger than the sum of its proper divisors (344192051).

1231349965 is a wasteful number, since it uses less digits than its factorization.

1231349965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029.

The product of its digits is 174960, while the sum is 43.

The square root of 1231349965 is about 35090.5965324045. The cubic root of 1231349965 is about 1071.8331069201.

The spelling of 1231349965 in words is "one billion, two hundred thirty-one million, three hundred forty-nine thousand, nine hundred sixty-five".