55393813 has 2 divisors, whose sum is σ = 55393814. Its totient is φ = 55393812.

The previous prime is 55393781. The next prime is 55393823. The reversal of 55393813 is 31839355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55011889 + 381924 = 7417^2 + 618^2 .

It is a cyclic number.

It is not a de Polignac number, because 55393813 - 2⁵ = 55393781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55393823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27696906 + 27696907.

It is an arithmetic number, because the mean of its divisors is an integer number (27696907).

Almost surely, 2^55393813 is an apocalyptic number.

It is an amenable number.

55393813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55393813 is an equidigital number, since it uses as much as digits as its factorization.

55393813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 37.

The square root of 55393813 is about 7442.7019959152. The cubic root of 55393813 is about 381.2007562305.

The spelling of 55393813 in words is "fifty-five million, three hundred ninety-three thousand, eight hundred thirteen".