55500031 has 2 divisors, whose sum is σ = 55500032. Its totient is φ = 55500030.

The previous prime is 55499993. The next prime is 55500041. The reversal of 55500031 is 13000555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55500031 - 2¹⁵ = 55467263 is a prime.

It is a super-2 number, since 2×55500031² = 6160506882001922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55499981 and 55500008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55500041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27750015 + 27750016.

It is an arithmetic number, because the mean of its divisors is an integer number (27750016).

Almost surely, 2^55500031 is an apocalyptic number.

55500031 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500031 is an equidigital number, since it uses as much as digits as its factorization.

55500031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 375, while the sum is 19.

The square root of 55500031 is about 7449.8342934592. The cubic root of 55500031 is about 381.4442523123. Note that the first 3 decimals are identical.

Adding to 55500031 its reverse (13000555), we get a palindrome (68500586).

The spelling of 55500031 in words is "fifty-five million, five hundred thousand, thirty-one".