355580813 has 4 divisors (see below), whose sum is σ = 406378080. Its totient is φ = 304783548.

The previous prime is 355580809. The next prime is 355580821. The reversal of 355580813 is 318085553.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318085553 = 739 ⋅430427.

It is a cyclic number.

It is not a de Polignac number, because 355580813 - 2² = 355580809 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 (355580843) 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, 25398623 + ... + 25398636.

It is an arithmetic number, because the mean of its divisors is an integer number (101594520).

Almost surely, 2^355580813 is an apocalyptic number.

It is an amenable number.

355580813 is a deficient number, since it is larger than the sum of its proper divisors (50797267).

355580813 is an equidigital number, since it uses as much as digits as its factorization.

355580813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50797266.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 355580813 is about 18856.8505588818. The cubic root of 355580813 is about 708.4558207494.

The spelling of 355580813 in words is "three hundred fifty-five million, five hundred eighty thousand, eight hundred thirteen".