69925721 has 4 divisors (see below), whose sum is σ = 69944244. Its totient is φ = 69907200.

The previous prime is 69925717. The next prime is 69925729. The reversal of 69925721 is 12752996.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45373696 + 24552025 = 6736^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 69925721 - 2² = 69925717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69925729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340 + ... + 11901.

It is an arithmetic number, because the mean of its divisors is an integer number (17486061).

Almost surely, 2^69925721 is an apocalyptic number.

It is an amenable number.

69925721 is a deficient number, since it is larger than the sum of its proper divisors (18523).

69925721 is a wasteful number, since it uses less digits than its factorization.

69925721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18522.

The product of its digits is 68040, while the sum is 41.

The square root of 69925721 is about 8362.1600678294. The cubic root of 69925721 is about 411.9827046028.

The spelling of 69925721 in words is "sixty-nine million, nine hundred twenty-five thousand, seven hundred twenty-one".