70521791 has 2 divisors, whose sum is σ = 70521792. Its totient is φ = 70521790.

The previous prime is 70521779. The next prime is 70521793. The reversal of 70521791 is 19712507.

It is a strong prime.

It is an emirp because it is prime and its reverse (19712507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70521791 - 2²² = 66327487 is a prime.

Together with 70521793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70521793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35260895 + 35260896.

It is an arithmetic number, because the mean of its divisors is an integer number (35260896).

Almost surely, 2^70521791 is an apocalyptic number.

70521791 is a deficient number, since it is larger than the sum of its proper divisors (1).

70521791 is an equidigital number, since it uses as much as digits as its factorization.

70521791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 70521791 is about 8397.7253467829. The cubic root of 70521791 is about 413.1500196632.

The spelling of 70521791 in words is "seventy million, five hundred twenty-one thousand, seven hundred ninety-one".