55957381 has 4 divisors (see below), whose sum is σ = 56175372. Its totient is φ = 55739392.

The previous prime is 55957379. The next prime is 55957393. The reversal of 55957381 is 18375955.

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 54022500 + 1934881 = 7350^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 55957381 - 2¹ = 55957379 is a prime.

It is a super-2 number, since 2×55957381² = 6262456976758322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55957351) 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, 108610 + ... + 109123.

It is an arithmetic number, because the mean of its divisors is an integer number (14043843).

Almost surely, 2^55957381 is an apocalyptic number.

It is an amenable number.

55957381 is a deficient number, since it is larger than the sum of its proper divisors (217991).

55957381 is a wasteful number, since it uses less digits than its factorization.

55957381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217990.

The product of its digits is 189000, while the sum is 43.

The square root of 55957381 is about 7480.4666298300. The cubic root of 55957381 is about 382.4891557152.

The spelling of 55957381 in words is "fifty-five million, nine hundred fifty-seven thousand, three hundred eighty-one".