545831989 has 2 divisors, whose sum is σ = 545831990. Its totient is φ = 545831988.

The previous prime is 545831861. The next prime is 545831999. The reversal of 545831989 is 989138545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428283025 + 117548964 = 20695^2 + 10842^2 .

It is a cyclic number.

It is not a de Polignac number, because 545831989 - 2⁷ = 545831861 is a prime.

It is a super-2 number, since 2×545831989² = 595865120431392242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545831999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272915994 + 272915995.

It is an arithmetic number, because the mean of its divisors is an integer number (272915995).

Almost surely, 2^545831989 is an apocalyptic number.

It is an amenable number.

545831989 is a deficient number, since it is larger than the sum of its proper divisors (1).

545831989 is an equidigital number, since it uses as much as digits as its factorization.

545831989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The square root of 545831989 is about 23363.0475109734. The cubic root of 545831989 is about 817.2463597284.

The spelling of 545831989 in words is "five hundred forty-five million, eight hundred thirty-one thousand, nine hundred eighty-nine".