55161090 has 96 divisors (see below), whose sum is σ = 156888576. Its totient is φ = 13386240.

The previous prime is 55161089. The next prime is 55161091. The reversal of 55161090 is 9016155.

55161090 is a `hidden beast` number, since 551 + 6 + 109 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (55161089) and next prime (55161091).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55161091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46849 + ... + 48011.

It is an arithmetic number, because the mean of its divisors is an integer number (1634256).

Almost surely, 2^55161090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55161090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78444288).

55161090 is an abundant number, since it is smaller than the sum of its proper divisors (101727486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55161090 is a wasteful number, since it uses less digits than its factorization.

55161090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 55161090 is about 7427.0512318147. The cubic root of 55161090 is about 380.6661675809. Note that the first 3 decimals are identical.

The spelling of 55161090 in words is "fifty-five million, one hundred sixty-one thousand, ninety".