1231455997 has 8 divisors (see below), whose sum is σ = 1271658752. Its totient is φ = 1191283200.

The previous prime is 1231455961. The next prime is 1231456003. The reversal of 1231455997 is 7995541321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231455997 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 (1231455917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101422 + ... + 112912.

It is an arithmetic number, because the mean of its divisors is an integer number (158957344).

Almost surely, 2^1231455997 is an apocalyptic number.

It is an amenable number.

1231455997 is a deficient number, since it is larger than the sum of its proper divisors (40202755).

1231455997 is a wasteful number, since it uses less digits than its factorization.

1231455997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14979.

The product of its digits is 340200, while the sum is 46.

The square root of 1231455997 is about 35092.1073319913. The cubic root of 1231455997 is about 1071.8638713518.

The spelling of 1231455997 in words is "one billion, two hundred thirty-one million, four hundred fifty-five thousand, nine hundred ninety-seven".