1231020131 has 8 divisors (see below), whose sum is σ = 1343207424. Its totient is φ = 1118878920.

The previous prime is 1231020103. The next prime is 1231020139. The reversal of 1231020131 is 1310201321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231020131 - 2⁶ = 1231020067 is a prime.

It is a super-2 number, since 2×1231020131² = 3030821125854514322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231020139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68606 + ... + 84668.

It is an arithmetic number, because the mean of its divisors is an integer number (167900928).

Almost surely, 2^1231020131 is an apocalyptic number.

1231020131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231020131 is a deficient number, since it is larger than the sum of its proper divisors (112187293).

1231020131 is a wasteful number, since it uses less digits than its factorization.

1231020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23041.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231020131 is about 35085.8964685242. The cubic root of 1231020131 is about 1071.7373966342.

Adding to 1231020131 its reverse (1310201321), we get a palindrome (2541221452).

It can be divided in two parts, 1 and 231020131, that added together give a palindrome (231020132).

The spelling of 1231020131 in words is "one billion, two hundred thirty-one million, twenty thousand, one hundred thirty-one".