55619807 has 2 divisors, whose sum is σ = 55619808. Its totient is φ = 55619806.

The previous prime is 55619803. The next prime is 55619813. The reversal of 55619807 is 70891655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55619807 - 2² = 55619803 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55619803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27809903 + 27809904.

It is an arithmetic number, because the mean of its divisors is an integer number (27809904).

Almost surely, 2^55619807 is an apocalyptic number.

55619807 is a deficient number, since it is larger than the sum of its proper divisors (1).

55619807 is an equidigital number, since it uses as much as digits as its factorization.

55619807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 55619807 is about 7457.8687974515. The cubic root of 55619807 is about 381.7184566000.

The spelling of 55619807 in words is "fifty-five million, six hundred nineteen thousand, eight hundred seven".