55131630 has 32 divisors (see below), whose sum is σ = 132710400. Its totient is φ = 14657952.

The previous prime is 55131623. The next prime is 55131631. The reversal of 55131630 is 3613155.

It is a self number, because there is not a number n which added to its sum of digits gives 55131630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8211 + ... + 13329.

It is an arithmetic number, because the mean of its divisors is an integer number (4147200).

Almost surely, 2^55131630 is an apocalyptic number.

55131630 is an abundant number, since it is smaller than the sum of its proper divisors (77578770).

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

55131630 is a wasteful number, since it uses less digits than its factorization.

55131630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5488.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 55131630 is about 7425.0676764593. The cubic root of 55131630 is about 380.5983877846.

Adding to 55131630 its reverse (3613155), we get a palindrome (58744785).

The spelling of 55131630 in words is "fifty-five million, one hundred thirty-one thousand, six hundred thirty".