55521402 has 16 divisors (see below), whose sum is σ = 115871040. Its totient is φ = 17702432.

The previous prime is 55521377. The next prime is 55521443. The reversal of 55521402 is 20412555.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201027 + ... + 201302.

It is an arithmetic number, because the mean of its divisors is an integer number (7241940).

Almost surely, 2^55521402 is an apocalyptic number.

55521402 is an abundant number, since it is smaller than the sum of its proper divisors (60349638).

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

55521402 is a wasteful number, since it uses less digits than its factorization.

55521402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402357.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 55521402 is about 7451.2684826142. The cubic root of 55521402 is about 381.4932060328.

Adding to 55521402 its reverse (20412555), we get a palindrome (75933957).

The spelling of 55521402 in words is "fifty-five million, five hundred twenty-one thousand, four hundred two".