42311551 has 6 divisors (see below), whose sum is σ = 43821752. Its totient is φ = 40851720.

The previous prime is 42311519. The next prime is 42311557. The reversal of 42311551 is 15511324.

It is a happy number.

It is not a de Polignac number, because 42311551 - 2⁵ = 42311519 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 (42311557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24315 + ... + 25996.

Almost surely, 2^42311551 is an apocalyptic number.

42311551 is a deficient number, since it is larger than the sum of its proper divisors (1510201).

42311551 is an equidigital number, since it uses as much as digits as its factorization.

42311551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50369 (or 50340 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 42311551 is about 6504.7329691541. The cubic root of 42311551 is about 348.4600397292.

Adding to 42311551 its reverse (15511324), we get a palindrome (57822875).

The spelling of 42311551 in words is "forty-two million, three hundred eleven thousand, five hundred fifty-one".