1331000031 has 4 divisors (see below), whose sum is σ = 1774666712. Its totient is φ = 887333352.

The previous prime is 1331000017. The next prime is 1331000051. The reversal of 1331000031 is 1300001331.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1331000031 - 2²¹ = 1328902879 is a prime.

It is a super-2 number, since 2×1331000031² = 3543122165044001922, 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 = 1330999980 and 1331000016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331000051) 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, 221833336 + ... + 221833341.

It is an arithmetic number, because the mean of its divisors is an integer number (443666678).

Almost surely, 2^1331000031 is an apocalyptic number.

1331000031 is a deficient number, since it is larger than the sum of its proper divisors (443666681).

1331000031 is an equidigital number, since it uses as much as digits as its factorization.

1331000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443666680.

The product of its (nonzero) digits is 27, while the sum is 12.

The square root of 1331000031 is about 36482.8731187663. The cubic root of 1331000031 is about 1100.0000085399. Note that the first 5 decimals are identical.

Adding to 1331000031 its reverse (1300001331), we get a palindrome (2631001362).

The spelling of 1331000031 in words is "one billion, three hundred thirty-one million, thirty-one", and thus it is an aban number.