70001891 has 8 divisors (see below), whose sum is σ = 72330720. Its totient is φ = 67696128.

The previous prime is 70001887. The next prime is 70001927. The reversal of 70001891 is 19810007.

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

It is a cyclic number.

It is not a de Polignac number, because 70001891 - 2² = 70001887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70001891.

It is not an unprimeable number, because it can be changed into a prime (70001851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515 + ... + 11843.

It is an arithmetic number, because the mean of its divisors is an integer number (9041340).

Almost surely, 2^70001891 is an apocalyptic number.

70001891 is a deficient number, since it is larger than the sum of its proper divisors (2328829).

70001891 is a wasteful number, since it uses less digits than its factorization.

70001891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11533.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 70001891 is about 8366.7132734426. The cubic root of 70001891 is about 412.1322410667.

Adding to 70001891 its reverse (19810007), we get a palindrome (89811898).

The spelling of 70001891 in words is "seventy million, one thousand, eight hundred ninety-one".