545731 has 2 divisors, whose sum is σ = 545732. Its totient is φ = 545730.

The previous prime is 545723. The next prime is 545747. The reversal of 545731 is 137545.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 545731 - 2³ = 545723 is a prime.

It is a super-2 number, since 2×545731² = 595644648722, which contains 22 as substring.

545731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 545696 and 545705.

It is not a weakly prime, because it can be changed into another prime (545711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272865 + 272866.

It is an arithmetic number, because the mean of its divisors is an integer number (272866).

2⁵⁴⁵⁷³¹ is an apocalyptic number.

545731 is a deficient number, since it is larger than the sum of its proper divisors (1).

545731 is an equidigital number, since it uses as much as digits as its factorization.

545731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 25.

The square root of 545731 is about 738.7360827792. The cubic root of 545731 is about 81.7195954729.

The spelling of 545731 in words is "five hundred forty-five thousand, seven hundred thirty-one".