1020231131 has 4 divisors (see below), whose sum is σ = 1023836472. Its totient is φ = 1016625792.

The previous prime is 1020231101. The next prime is 1020231143. The reversal of 1020231131 is 1311320201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1311320201 = 5651 ⋅232051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020231131 is a prime.

It is a super-2 number, since 2×1020231131² = 2081743121323078322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020231101) 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, 1802246 + ... + 1802811.

It is an arithmetic number, because the mean of its divisors is an integer number (255959118).

Almost surely, 2^1020231131 is an apocalyptic number.

1020231131 is a deficient number, since it is larger than the sum of its proper divisors (3605341).

1020231131 is an equidigital number, since it uses as much as digits as its factorization.

1020231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605340.

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

The square root of 1020231131 is about 31941.0571365445. The cubic root of 1020231131 is about 1006.6987370575.

Adding to 1020231131 its reverse (1311320201), we get a palindrome (2331551332).

The spelling of 1020231131 in words is "one billion, twenty million, two hundred thirty-one thousand, one hundred thirty-one".