70991211391 has 4 divisors (see below), whose sum is σ = 71889834400. Its totient is φ = 70092588384.

The previous prime is 70991211377. The next prime is 70991211419. The reversal of 70991211391 is 19311219907.

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

It is a cyclic number.

It is not a de Polignac number, because 70991211391 - 2⁵ = 70991211359 is a prime.

It is a super-3 number, since 3×70991211391³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70991211491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449311386 + ... + 449311543.

It is an arithmetic number, because the mean of its divisors is an integer number (17972458600).

Almost surely, 2^70991211391 is an apocalyptic number.

70991211391 is a deficient number, since it is larger than the sum of its proper divisors (898623009).

70991211391 is an equidigital number, since it uses as much as digits as its factorization.

70991211391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898623008.

The product of its (nonzero) digits is 30618, while the sum is 43.

The spelling of 70991211391 in words is "seventy billion, nine hundred ninety-one million, two hundred eleven thousand, three hundred ninety-one".