1655531 has 2 divisors, whose sum is σ = 1655532. Its totient is φ = 1655530.

The previous prime is 1655509. The next prime is 1655551. The reversal of 1655531 is 1355561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1655531 - 2¹⁴ = 1639147 is a prime.

It is a super-2 number, since 2×1655531² = 5481565783922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1655531.

It is not a weakly prime, because it can be changed into another prime (1655551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827765 + 827766.

It is an arithmetic number, because the mean of its divisors is an integer number (827766).

2^1655531 is an apocalyptic number.

1655531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655531 is an equidigital number, since it uses as much as digits as its factorization.

1655531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 26.

The square root of 1655531 is about 1286.6743954863. The cubic root of 1655531 is about 118.2984640147.

The spelling of 1655531 in words is "one million, six hundred fifty-five thousand, five hundred thirty-one".