1031220131 has 4 divisors (see below), whose sum is σ = 1031407272. Its totient is φ = 1031032992.

The previous prime is 1031220121. The next prime is 1031220133. The reversal of 1031220131 is 1310221301.

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 1031220131 - 2¹⁰ = 1031219107 is a prime.

It is a super-2 number, since 2×1031220131² = 2126829917159314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1031220133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85046 + ... + 96411.

It is an arithmetic number, because the mean of its divisors is an integer number (257851818).

Almost surely, 2^1031220131 is an apocalyptic number.

1031220131 is a deficient number, since it is larger than the sum of its proper divisors (187141).

1031220131 is an equidigital number, since it uses as much as digits as its factorization.

1031220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187140.

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

The square root of 1031220131 is about 32112.6163835960. The cubic root of 1031220131 is about 1010.3002508959.

Adding to 1031220131 its reverse (1310221301), we get a palindrome (2341441432).

The spelling of 1031220131 in words is "one billion, thirty-one million, two hundred twenty thousand, one hundred thirty-one".