1201131631 has 4 divisors (see below), whose sum is σ = 1372721872. Its totient is φ = 1029541392.

The previous prime is 1201131623. The next prime is 1201131641. The reversal of 1201131631 is 1361311021.

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 1201131631 - 2³ = 1201131623 is a prime.

It is a super-2 number, since 2×1201131631² = 2885434389977440322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201131599 and 1201131608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201131601) 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, 85795110 + ... + 85795123.

It is an arithmetic number, because the mean of its divisors is an integer number (343180468).

Almost surely, 2^1201131631 is an apocalyptic number.

1201131631 is a deficient number, since it is larger than the sum of its proper divisors (171590241).

1201131631 is an equidigital number, since it uses as much as digits as its factorization.

1201131631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171590240.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1201131631 is about 34657.3459889819. The cubic root of 1201131631 is about 1062.9925023963.

Adding to 1201131631 its reverse (1361311021), we get a palindrome (2562442652).

The spelling of 1201131631 in words is "one billion, two hundred one million, one hundred thirty-one thousand, six hundred thirty-one".