55138099 has 2 divisors, whose sum is σ = 55138100. Its totient is φ = 55138098.

The previous prime is 55138093. The next prime is 55138117. The reversal of 55138099 is 99083155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55138099 - 2³ = 55138091 is a prime.

It is a super-2 number, since 2×55138099² = 6080419922667602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55138091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27569049 + 27569050.

It is an arithmetic number, because the mean of its divisors is an integer number (27569050).

Almost surely, 2^55138099 is an apocalyptic number.

55138099 is a deficient number, since it is larger than the sum of its proper divisors (1).

55138099 is an equidigital number, since it uses as much as digits as its factorization.

55138099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 55138099 is about 7425.5032826065. The cubic root of 55138099 is about 380.6132733393.

The spelling of 55138099 in words is "fifty-five million, one hundred thirty-eight thousand, ninety-nine".