545155531 has 2 divisors, whose sum is σ = 545155532. Its totient is φ = 545155530.

The previous prime is 545155519. The next prime is 545155561. The reversal of 545155531 is 135551545.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 545155531 - 2⁹ = 545155019 is a prime.

It is a super-2 number, since 2×545155531² = 594389105959783922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (545155561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272577765 + 272577766.

It is an arithmetic number, because the mean of its divisors is an integer number (272577766).

Almost surely, 2^545155531 is an apocalyptic number.

545155531 is a deficient number, since it is larger than the sum of its proper divisors (1).

545155531 is an equidigital number, since it uses as much as digits as its factorization.

545155531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37500, while the sum is 34.

The square root of 545155531 is about 23348.5659302665. The cubic root of 545155531 is about 816.9086114929.

The spelling of 545155531 in words is "five hundred forty-five million, one hundred fifty-five thousand, five hundred thirty-one".