42251331 has 4 divisors (see below), whose sum is σ = 56335112. Its totient is φ = 28167552.

The previous prime is 42251323. The next prime is 42251351. The reversal of 42251331 is 13315224.

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

It is not a de Polignac number, because 42251331 - 2³ = 42251323 is a prime.

It is a super-2 number, since 2×42251331² = 3570349942543122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42251298 and 42251307.

It is not an unprimeable number, because it can be changed into a prime (42251311) 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, 7041886 + ... + 7041891.

It is an arithmetic number, because the mean of its divisors is an integer number (14083778).

Almost surely, 2^42251331 is an apocalyptic number.

42251331 is a deficient number, since it is larger than the sum of its proper divisors (14083781).

42251331 is a wasteful number, since it uses less digits than its factorization.

42251331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14083780.

The product of its digits is 720, while the sum is 21.

The square root of 42251331 is about 6500.1023838090. The cubic root of 42251331 is about 348.2946457546.

Adding to 42251331 its reverse (13315224), we get a palindrome (55566555).

The spelling of 42251331 in words is "forty-two million, two hundred fifty-one thousand, three hundred thirty-one".