655403531 has 2 divisors, whose sum is σ = 655403532. Its totient is φ = 655403530.

The previous prime is 655403471. The next prime is 655403543. The reversal of 655403531 is 135304556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655403531 - 2¹⁴ = 655387147 is a prime.

It is a super-2 number, since 2×655403531² = 859107576894535922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (655403131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327701765 + 327701766.

It is an arithmetic number, because the mean of its divisors is an integer number (327701766).

Almost surely, 2^655403531 is an apocalyptic number.

655403531 is a deficient number, since it is larger than the sum of its proper divisors (1).

655403531 is an equidigital number, since it uses as much as digits as its factorization.

655403531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 655403531 is about 25600.8502007258. The cubic root of 655403531 is about 868.6328688692.

The spelling of 655403531 in words is "six hundred fifty-five million, four hundred three thousand, five hundred thirty-one".