70548721 has 2 divisors, whose sum is σ = 70548722. Its totient is φ = 70548720.

The previous prime is 70548689. The next prime is 70548727. The reversal of 70548721 is 12784507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 15210000 = 7439^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 70548721 - 2⁵ = 70548689 is a prime.

It is not a weakly prime, because it can be changed into another prime (70548727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35274360 + 35274361.

It is an arithmetic number, because the mean of its divisors is an integer number (35274361).

Almost surely, 2^70548721 is an apocalyptic number.

It is an amenable number.

70548721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70548721 is an equidigital number, since it uses as much as digits as its factorization.

70548721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 70548721 is about 8399.3286041207. The cubic root of 70548721 is about 413.2026025313.

The spelling of 70548721 in words is "seventy million, five hundred forty-eight thousand, seven hundred twenty-one".