709531 has 2 divisors, whose sum is σ = 709532. Its totient is φ = 709530.

The previous prime is 709519. The next prime is 709537. The reversal of 709531 is 135907.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 709531 - 2¹⁵ = 676763 is a prime.

It is a super-2 number, since 2×709531² = 1006868479922, which contains 22 as substring.

It is equal to p₅₇₂₆₅ and since 709531 and 57265 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 709496 and 709505.

It is not a weakly prime, because it can be changed into another prime (709537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354765 + 354766.

It is an arithmetic number, because the mean of its divisors is an integer number (354766).

2⁷⁰⁹⁵³¹ is an apocalyptic number.

709531 is a deficient number, since it is larger than the sum of its proper divisors (1).

709531 is an equidigital number, since it uses as much as digits as its factorization.

709531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 709531 is about 842.3366310449. The cubic root of 709531 is about 89.1915664974.

The spelling of 709531 in words is "seven hundred nine thousand, five hundred thirty-one".