55347981 has 8 divisors (see below), whose sum is σ = 79474080. Its totient is φ = 34060272.

The previous prime is 55347917. The next prime is 55347983. The reversal of 55347981 is 18974355.

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

It is not a de Polignac number, because 55347981 - 2⁶ = 55347917 is a prime.

It is a super-2 number, since 2×55347981² = 6126798001552722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55347983) 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, 709551 + ... + 709628.

It is an arithmetic number, because the mean of its divisors is an integer number (9934260).

Almost surely, 2^55347981 is an apocalyptic number.

It is an amenable number.

55347981 is a deficient number, since it is larger than the sum of its proper divisors (24126099).

55347981 is a wasteful number, since it uses less digits than its factorization.

55347981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419195.

The product of its digits is 151200, while the sum is 42.

The square root of 55347981 is about 7439.6223694486. The cubic root of 55347981 is about 381.0955939822.

The spelling of 55347981 in words is "fifty-five million, three hundred forty-seven thousand, nine hundred eighty-one".