55213619 has 2 divisors, whose sum is σ = 55213620. Its totient is φ = 55213618.

The previous prime is 55213607. The next prime is 55213621. The reversal of 55213619 is 91631255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55213619 - 2²⁴ = 38436403 is a prime.

It is a super-2 number, since 2×55213619² = 6097087446154322, which contains 22 as substring.

Together with 55213621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55213679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27606809 + 27606810.

It is an arithmetic number, because the mean of its divisors is an integer number (27606810).

Almost surely, 2^55213619 is an apocalyptic number.

55213619 is a deficient number, since it is larger than the sum of its proper divisors (1).

55213619 is an equidigital number, since it uses as much as digits as its factorization.

55213619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 32.

The square root of 55213619 is about 7430.5867197685. The cubic root of 55213619 is about 380.7869632914.

The spelling of 55213619 in words is "fifty-five million, two hundred thirteen thousand, six hundred nineteen".