55391723 has 2 divisors, whose sum is σ = 55391724. Its totient is φ = 55391722.

The previous prime is 55391671. The next prime is 55391741. The reversal of 55391723 is 32719355.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55391723 is a prime.

It is not a weakly prime, because it can be changed into another prime (55391773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27695861 + 27695862.

It is an arithmetic number, because the mean of its divisors is an integer number (27695862).

Almost surely, 2^55391723 is an apocalyptic number.

55391723 is a deficient number, since it is larger than the sum of its proper divisors (1).

55391723 is an equidigital number, since it uses as much as digits as its factorization.

55391723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 35.

The square root of 55391723 is about 7442.5615885930. The cubic root of 55391723 is about 381.1959619550.

The spelling of 55391723 in words is "fifty-five million, three hundred ninety-one thousand, seven hundred twenty-three".