51642231 has 4 divisors (see below), whose sum is σ = 68856312. Its totient is φ = 34428152.

The previous prime is 51642229. The next prime is 51642233. The reversal of 51642231 is 13224615.

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 (51642229) and next prime (51642233).

It is a cyclic number.

It is not a de Polignac number, because 51642231 - 2¹ = 51642229 is a prime.

It is a super-2 number, since 2×51642231² = 5333840045314722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8607036 + ... + 8607041.

It is an arithmetic number, because the mean of its divisors is an integer number (17214078).

Almost surely, 2^51642231 is an apocalyptic number.

51642231 is a deficient number, since it is larger than the sum of its proper divisors (17214081).

51642231 is a wasteful number, since it uses less digits than its factorization.

51642231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214080.

The product of its digits is 1440, while the sum is 24.

The square root of 51642231 is about 7186.2529178982. The cubic root of 51642231 is about 372.3931342169.

Adding to 51642231 its reverse (13224615), we get a palindrome (64866846).

The spelling of 51642231 in words is "fifty-one million, six hundred forty-two thousand, two hundred thirty-one".