1231677631 has 4 divisors (see below), whose sum is σ = 1233164200. Its totient is φ = 1230191064.

The previous prime is 1231677617. The next prime is 1231677649. The reversal of 1231677631 is 1367761321.

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 1231677631 - 2⁵ = 1231677599 is a prime.

It is a super-2 number, since 2×1231677631² = 3034059573411544322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231677131) 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, 742041 + ... + 743698.

It is an arithmetic number, because the mean of its divisors is an integer number (308291050).

Almost surely, 2^1231677631 is an apocalyptic number.

1231677631 is a deficient number, since it is larger than the sum of its proper divisors (1486569).

1231677631 is an equidigital number, since it uses as much as digits as its factorization.

1231677631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486568.

The product of its digits is 31752, while the sum is 37.

The square root of 1231677631 is about 35095.2650794947. The cubic root of 1231677631 is about 1071.9281711800.

The spelling of 1231677631 in words is "one billion, two hundred thirty-one million, six hundred seventy-seven thousand, six hundred thirty-one".