42151691 has 4 divisors (see below), whose sum is σ = 42213384. Its totient is φ = 42090000.

The previous prime is 42151679. The next prime is 42151693. The reversal of 42151691 is 19615124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42151691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42151693) 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, 29810 + ... + 31191.

It is an arithmetic number, because the mean of its divisors is an integer number (10553346).

Almost surely, 2^42151691 is an apocalyptic number.

42151691 is a deficient number, since it is larger than the sum of its proper divisors (61693).

42151691 is an equidigital number, since it uses as much as digits as its factorization.

42151691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61692.

The product of its digits is 2160, while the sum is 29.

The square root of 42151691 is about 6492.4333650797. The cubic root of 42151691 is about 348.0206394373.

The spelling of 42151691 in words is "forty-two million, one hundred fifty-one thousand, six hundred ninety-one".