42691901 has 4 divisors (see below), whose sum is σ = 48790752. Its totient is φ = 36593052.

The previous prime is 42691897. The next prime is 42691919. The reversal of 42691901 is 10919624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42691901 - 2² = 42691897 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 (42691951) 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, 3049415 + ... + 3049428.

It is an arithmetic number, because the mean of its divisors is an integer number (12197688).

Almost surely, 2^42691901 is an apocalyptic number.

It is an amenable number.

42691901 is a deficient number, since it is larger than the sum of its proper divisors (6098851).

42691901 is an equidigital number, since it uses as much as digits as its factorization.

42691901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6098850.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 42691901 is about 6533.9039631755. The cubic root of 42691901 is about 349.5010605076.

The spelling of 42691901 in words is "forty-two million, six hundred ninety-one thousand, nine hundred one".