55811013 has 4 divisors (see below), whose sum is σ = 74414688. Its totient is φ = 37207340.

The previous prime is 55811009. The next prime is 55811023. The reversal of 55811013 is 31011855.

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.

It is a cyclic number.

It is not a de Polignac number, because 55811013 - 2² = 55811009 is a prime.

It is a super-2 number, since 2×55811013² = 6229738344172338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55811003) 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, 9301833 + ... + 9301838.

It is an arithmetic number, because the mean of its divisors is an integer number (18603672).

Almost surely, 2^55811013 is an apocalyptic number.

It is an amenable number.

55811013 is a deficient number, since it is larger than the sum of its proper divisors (18603675).

55811013 is a wasteful number, since it uses less digits than its factorization.

55811013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18603674.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 55811013 is about 7470.6768769637. The cubic root of 55811013 is about 382.1553715894.

Adding to 55811013 its reverse (31011855), we get a palindrome (86822868).

The spelling of 55811013 in words is "fifty-five million, eight hundred eleven thousand, thirteen".