1031531 has 2 divisors, whose sum is σ = 1031532. Its totient is φ = 1031530.

The previous prime is 1031521. The next prime is 1031533. The reversal of 1031531 is 1351301.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1031531 - 2¹⁸ = 769387 is a prime.

It is a super-2 number, since 2×1031531² = 2128112407922, which contains 22 as substring.

Together with 1031533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1031533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515765 + 515766.

It is an arithmetic number, because the mean of its divisors is an integer number (515766).

2^1031531 is an apocalyptic number.

1031531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031531 is an equidigital number, since it uses as much as digits as its factorization.

1031531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 1031531 is about 1015.6431459917. The cubic root of 1031531 is about 101.0401761545.

Adding to 1031531 its reverse (1351301), we get a palindrome (2382832).

The spelling of 1031531 in words is "one million, thirty-one thousand, five hundred thirty-one".