42231551 has 4 divisors (see below), whose sum is σ = 42947400. Its totient is φ = 41515704.

The previous prime is 42231499. The next prime is 42231559. The reversal of 42231551 is 15513224.

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

It is not a de Polignac number, because 42231551 - 2¹⁰ = 42230527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42231559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357836 + ... + 357953.

It is an arithmetic number, because the mean of its divisors is an integer number (10736850).

Almost surely, 2^42231551 is an apocalyptic number.

42231551 is a deficient number, since it is larger than the sum of its proper divisors (715849).

42231551 is an equidigital number, since it uses as much as digits as its factorization.

42231551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715848.

The product of its digits is 1200, while the sum is 23.

The square root of 42231551 is about 6498.5806911971. The cubic root of 42231551 is about 348.2402857831.

Adding to 42231551 its reverse (15513224), we get a palindrome (57744775).

The spelling of 42231551 in words is "forty-two million, two hundred thirty-one thousand, five hundred fifty-one".