55731506 has 4 divisors (see below), whose sum is σ = 83597262. Its totient is φ = 27865752.

The previous prime is 55731449. The next prime is 55731523. The reversal of 55731506 is 60513755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60513755 = 5 ⋅12102751.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 5958481 = 7055^2 + 2441^2 .

It is a super-2 number, since 2×55731506² = 6212001522056072, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13932875 + ... + 13932878.

Almost surely, 2^55731506 is an apocalyptic number.

55731506 is a deficient number, since it is larger than the sum of its proper divisors (27865756).

55731506 is a wasteful number, since it uses less digits than its factorization.

55731506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27865755.

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 55731506 is about 7465.3537089678. The cubic root of 55731506 is about 381.9738156262.

It can be divided in two parts, 5573 and 1506, that multiplied together give a palindrome (8392938).

The spelling of 55731506 in words is "fifty-five million, seven hundred thirty-one thousand, five hundred six".