545381 has 4 divisors (see below), whose sum is σ = 547200. Its totient is φ = 543564.

The previous prime is 545371. The next prime is 545387. The reversal of 545381 is 183545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183545 = 5 ⋅36709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545381 is a prime.

It is a super-2 number, since 2×545381² = 594880870322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (136800).

2⁵⁴⁵³⁸¹ is an apocalyptic number.

It is an amenable number.

545381 is a deficient number, since it is larger than the sum of its proper divisors (1819).

545381 is a wasteful number, since it uses less digits than its factorization.

545381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

The product of its digits is 2400, while the sum is 26.

The square root of 545381 is about 738.4991536894. The cubic root of 545381 is about 81.7021216777.

The spelling of 545381 in words is "five hundred forty-five thousand, three hundred eighty-one".