55981263 has 8 divisors (see below), whose sum is σ = 80383408. Its totient is φ = 34449984.

The previous prime is 55981253. The next prime is 55981273. The reversal of 55981263 is 36218955.

It is an interprime number because it is at equal distance from previous prime (55981253) and next prime (55981273).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55981263 - 2⁶ = 55981199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1435417 = 55981263 / (5 + 5 + 9 + 8 + 1 + 2 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55981213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717670 + ... + 717747.

It is an arithmetic number, because the mean of its divisors is an integer number (10047926).

Almost surely, 2^55981263 is an apocalyptic number.

55981263 is a deficient number, since it is larger than the sum of its proper divisors (24402145).

55981263 is a wasteful number, since it uses less digits than its factorization.

55981263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435433.

The product of its digits is 64800, while the sum is 39.

The square root of 55981263 is about 7482.0627503383. The cubic root of 55981263 is about 382.5435620428.

The spelling of 55981263 in words is "fifty-five million, nine hundred eighty-one thousand, two hundred sixty-three".