69721061 has 4 divisors (see below), whose sum is σ = 71605452. Its totient is φ = 67836672.

The previous prime is 69721049. The next prime is 69721121. The reversal of 69721061 is 16012796.

It is a happy number.

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 24750625 + 44970436 = 4975^2 + 6706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69721061 is a prime.

It is a super-2 number, since 2×69721061² = 9722052693931442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69721961) 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, 942140 + ... + 942213.

It is an arithmetic number, because the mean of its divisors is an integer number (17901363).

Almost surely, 2^69721061 is an apocalyptic number.

It is an amenable number.

69721061 is a deficient number, since it is larger than the sum of its proper divisors (1884391).

69721061 is a wasteful number, since it uses less digits than its factorization.

69721061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884390.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 69721061 is about 8349.9138318907. The cubic root of 69721061 is about 411.5803787597.

The spelling of 69721061 in words is "sixty-nine million, seven hundred twenty-one thousand, sixty-one".