42051381 has 8 divisors (see below), whose sum is σ = 56103264. Its totient is φ = 28016880.

The previous prime is 42051349. The next prime is 42051391. The reversal of 42051381 is 18315024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42051381 - 2⁵ = 42051349 is a prime.

It is a super-2 number, since 2×42051381² = 3536637288014322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42051311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3150 + ... + 9696.

It is an arithmetic number, because the mean of its divisors is an integer number (7012908).

Almost surely, 2^42051381 is an apocalyptic number.

It is an amenable number.

42051381 is a deficient number, since it is larger than the sum of its proper divisors (14051883).

42051381 is a wasteful number, since it uses less digits than its factorization.

42051381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8691.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 42051381 is about 6484.7036169743. The cubic root of 42051381 is about 347.7443541262.

The spelling of 42051381 in words is "forty-two million, fifty-one thousand, three hundred eighty-one".