1009531 has 2 divisors, whose sum is σ = 1009532. Its totient is φ = 1009530.

The previous prime is 1009507. The next prime is 1009537. The reversal of 1009531 is 1359001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1009531 - 2⁵ = 1009499 is a prime.

It is a super-2 number, since 2×1009531² = 2038305679922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1009499 and 1009508.

It is not a weakly prime, because it can be changed into another prime (1009537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504765 + 504766.

It is an arithmetic number, because the mean of its divisors is an integer number (504766).

2^1009531 is an apocalyptic number.

1009531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009531 is an equidigital number, since it uses as much as digits as its factorization.

1009531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 1009531 is about 1004.7541987969. The cubic root of 1009531 is about 100.3166959778.

It can be divided in two parts, 1009 and 531, that added together give a triangular number (1540 = T₅₅).

The spelling of 1009531 in words is "one million, nine thousand, five hundred thirty-one".