655540531 has 2 divisors, whose sum is σ = 655540532. Its totient is φ = 655540530.

The previous prime is 655540493. The next prime is 655540559. The reversal of 655540531 is 135045556.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 655540531 - 2²⁷ = 521322803 is a prime.

It is a super-2 number, since 2×655540531² = 859466775567523922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (655580531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327770265 + 327770266.

It is an arithmetic number, because the mean of its divisors is an integer number (327770266).

Almost surely, 2^655540531 is an apocalyptic number.

655540531 is a deficient number, since it is larger than the sum of its proper divisors (1).

655540531 is an equidigital number, since it uses as much as digits as its factorization.

655540531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 655540531 is about 25603.5257533020. The cubic root of 655540531 is about 868.6933885371.

The spelling of 655540531 in words is "six hundred fifty-five million, five hundred forty thousand, five hundred thirty-one".