70919521 has 4 divisors (see below), whose sum is σ = 71089200. Its totient is φ = 70749844.

The previous prime is 70919509. The next prime is 70919531. The reversal of 70919521 is 12591907.

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 70919521 - 2⁵ = 70919489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70919501) 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 3 ways as a sum of consecutive naturals, for example, 84211 + ... + 85048.

It is an arithmetic number, because the mean of its divisors is an integer number (17772300).

Almost surely, 2^70919521 is an apocalyptic number.

It is an amenable number.

70919521 is a deficient number, since it is larger than the sum of its proper divisors (169679).

70919521 is a wasteful number, since it uses less digits than its factorization.

70919521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169678.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 70919521 is about 8421.3728690754. The cubic root of 70919521 is about 413.9252609215.

The spelling of 70919521 in words is "seventy million, nine hundred nineteen thousand, five hundred twenty-one".