55591493 has 4 divisors (see below), whose sum is σ = 55902240. Its totient is φ = 55280748.

The previous prime is 55591489. The next prime is 55591507. The reversal of 55591493 is 39419555.

It is a happy number.

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 55591493 - 2² = 55591489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55591493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55591423) 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, 155105 + ... + 155462.

It is an arithmetic number, because the mean of its divisors is an integer number (13975560).

Almost surely, 2^55591493 is an apocalyptic number.

It is an amenable number.

55591493 is a deficient number, since it is larger than the sum of its proper divisors (310747).

55591493 is a wasteful number, since it uses less digits than its factorization.

55591493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310746.

The product of its digits is 121500, while the sum is 41.

The square root of 55591493 is about 7455.9702923228. The cubic root of 55591493 is about 381.6536726590.

The spelling of 55591493 in words is "fifty-five million, five hundred ninety-one thousand, four hundred ninety-three".