1231255973 has 4 divisors (see below), whose sum is σ = 1231784268. Its totient is φ = 1230727680.

The previous prime is 1231255969. The next prime is 1231256003. The reversal of 1231255973 is 3795521321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3795521321 = 61 ⋅62221661.

It can be written as a sum of positive squares in 2 ways, for example, as 816644929 + 414611044 = 28577^2 + 20362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231255973 - 2² = 1231255969 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 (1231255373) 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, 260636 + ... + 265317.

It is an arithmetic number, because the mean of its divisors is an integer number (307946067).

Almost surely, 2^1231255973 is an apocalyptic number.

It is an amenable number.

1231255973 is a deficient number, since it is larger than the sum of its proper divisors (528295).

1231255973 is an equidigital number, since it uses as much as digits as its factorization.

1231255973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528294.

The product of its digits is 56700, while the sum is 38.

The square root of 1231255973 is about 35089.2572306682. The cubic root of 1231255973 is about 1071.8058343321.

The spelling of 1231255973 in words is "one billion, two hundred thirty-one million, two hundred fifty-five thousand, nine hundred seventy-three".