55231642 has 4 divisors (see below), whose sum is σ = 82847466. Its totient is φ = 27615820.

The previous prime is 55231621. The next prime is 55231663. The reversal of 55231642 is 24613255.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55231621) and next prime (55231663).

It can be written as a sum of positive squares in only one way, i.e., 55219761 + 11881 = 7431^2 + 109^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55231642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13807909 + ... + 13807912.

Almost surely, 2^55231642 is an apocalyptic number.

55231642 is a deficient number, since it is larger than the sum of its proper divisors (27615824).

55231642 is a wasteful number, since it uses less digits than its factorization.

55231642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27615823.

The product of its digits is 7200, while the sum is 28.

The square root of 55231642 is about 7431.7993783471. The cubic root of 55231642 is about 380.8283913361.

Adding to 55231642 its reverse (24613255), we get a palindrome (79844897).

The spelling of 55231642 in words is "fifty-five million, two hundred thirty-one thousand, six hundred forty-two".