55500331 has 2 divisors, whose sum is σ = 55500332. Its totient is φ = 55500330.

The previous prime is 55500317. The next prime is 55500371. The reversal of 55500331 is 13300555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55500331 - 2⁵ = 55500299 is a prime.

It is a super-2 number, since 2×55500331² = 6160573482219122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55500371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27750165 + 27750166.

It is an arithmetic number, because the mean of its divisors is an integer number (27750166).

Almost surely, 2^55500331 is an apocalyptic number.

55500331 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500331 is an equidigital number, since it uses as much as digits as its factorization.

55500331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 55500331 is about 7449.8544281080. The cubic root of 55500331 is about 381.4449395976. Note that the first 3 decimals are identical.

Adding to 55500331 its reverse (13300555), we get a palindrome (68800886).

The spelling of 55500331 in words is "fifty-five million, five hundred thousand, three hundred thirty-one".