55231009 has 2 divisors, whose sum is σ = 55231010. Its totient is φ = 55231008.

The previous prime is 55230953. The next prime is 55231013. The reversal of 55231009 is 90013255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38787984 + 16443025 = 6228^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 55231009 - 2¹¹ = 55228961 is a prime.

It is not a weakly prime, because it can be changed into another prime (55231039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27615504 + 27615505.

It is an arithmetic number, because the mean of its divisors is an integer number (27615505).

Almost surely, 2^55231009 is an apocalyptic number.

It is an amenable number.

55231009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55231009 is an equidigital number, since it uses as much as digits as its factorization.

55231009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 55231009 is about 7431.7567909613. The cubic root of 55231009 is about 380.8269364618.

The spelling of 55231009 in words is "fifty-five million, two hundred thirty-one thousand, nine".