70721719 has 2 divisors, whose sum is σ = 70721720. Its totient is φ = 70721718.

The previous prime is 70721687. The next prime is 70721731. The reversal of 70721719 is 91712707.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70721719 - 2⁵ = 70721687 is a prime.

It is a super-2 number, since 2×70721719² = 10003123076629922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70721759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35360859 + 35360860.

It is an arithmetic number, because the mean of its divisors is an integer number (35360860).

Almost surely, 2^70721719 is an apocalyptic number.

70721719 is a deficient number, since it is larger than the sum of its proper divisors (1).

70721719 is an equidigital number, since it uses as much as digits as its factorization.

70721719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 70721719 is about 8409.6206216452. The cubic root of 70721719 is about 413.5400755685.

The spelling of 70721719 in words is "seventy million, seven hundred twenty-one thousand, seven hundred nineteen".