70151721 has 4 divisors (see below), whose sum is σ = 93535632. Its totient is φ = 46767812.

The previous prime is 70151713. The next prime is 70151723. The reversal of 70151721 is 12715107.

It is a happy number.

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 70151721 - 2³ = 70151713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70151691 and 70151700.

It is not an unprimeable number, because it can be changed into a prime (70151723) 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 in 3 ways as a sum of consecutive naturals, for example, 11691951 + ... + 11691956.

It is an arithmetic number, because the mean of its divisors is an integer number (23383908).

Almost surely, 2^70151721 is an apocalyptic number.

It is an amenable number.

70151721 is a deficient number, since it is larger than the sum of its proper divisors (23383911).

70151721 is a wasteful number, since it uses less digits than its factorization.

70151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23383910.

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 70151721 is about 8375.6624215640. The cubic root of 70151721 is about 412.4260701300.

Adding to 70151721 its reverse (12715107), we get a palindrome (82866828).

The spelling of 70151721 in words is "seventy million, one hundred fifty-one thousand, seven hundred twenty-one".