3691531 has 2 divisors, whose sum is σ = 3691532. Its totient is φ = 3691530.

The previous prime is 3691489. The next prime is 3691547. The reversal of 3691531 is 1351963.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3691531 - 2⁷ = 3691403 is a prime.

It is a super-2 number, since 2×3691531² = 27254802247922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3691531.

It is not a weakly prime, because it can be changed into another prime (3691561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1845765 + 1845766.

It is an arithmetic number, because the mean of its divisors is an integer number (1845766).

Almost surely, 2^3691531 is an apocalyptic number.

3691531 is a deficient number, since it is larger than the sum of its proper divisors (1).

3691531 is an equidigital number, since it uses as much as digits as its factorization.

3691531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 28.

The square root of 3691531 is about 1921.3357332856. The cubic root of 3691531 is about 154.5499396937.

The spelling of 3691531 in words is "three million, six hundred ninety-one thousand, five hundred thirty-one".