55529381 has 12 divisors (see below), whose sum is σ = 58983372. Its totient is φ = 52268544.

The previous prime is 55529377. The next prime is 55529387. The reversal of 55529381 is 18392555.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 35593156 = 4465^2 + 5966^2 .

It is not a de Polignac number, because 55529381 - 2² = 55529377 is a prime.

It is a super-2 number, since 2×55529381² = 6167024308486322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55529387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69275 + ... + 70071.

It is an arithmetic number, because the mean of its divisors is an integer number (4915281).

Almost surely, 2^55529381 is an apocalyptic number.

It is an amenable number.

55529381 is a deficient number, since it is larger than the sum of its proper divisors (3453991).

55529381 is a wasteful number, since it uses less digits than its factorization.

55529381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028 (or 1009 counting only the distinct ones).

The product of its digits is 54000, while the sum is 38.

The square root of 55529381 is about 7451.8038755727. The cubic root of 55529381 is about 381.5114799979.

The spelling of 55529381 in words is "fifty-five million, five hundred twenty-nine thousand, three hundred eighty-one".