55420613 has 4 divisors (see below), whose sum is σ = 55447788. Its totient is φ = 55393440.

The previous prime is 55420583. The next prime is 55420649. The reversal of 55420613 is 31602455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38912644 + 16507969 = 6238^2 + 4063^2 .

It is a cyclic number.

It is not a de Polignac number, because 55420613 - 2¹⁰ = 55419589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10256 + ... + 14697.

It is an arithmetic number, because the mean of its divisors is an integer number (13861947).

Almost surely, 2^55420613 is an apocalyptic number.

It is an amenable number.

55420613 is a deficient number, since it is larger than the sum of its proper divisors (27175).

55420613 is a wasteful number, since it uses less digits than its factorization.

55420613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27174.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 55420613 is about 7444.5021996101. The cubic root of 55420613 is about 381.2622223798.

The spelling of 55420613 in words is "fifty-five million, four hundred twenty thousand, six hundred thirteen".