69130921 has 4 divisors (see below), whose sum is σ = 70435332. Its totient is φ = 67826512.

The previous prime is 69130913. The next prime is 69130931. The reversal of 69130921 is 12903196.

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 56250000 + 12880921 = 7500^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 69130921 - 2³ = 69130913 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69130931) 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, 652126 + ... + 652231.

It is an arithmetic number, because the mean of its divisors is an integer number (17608833).

Almost surely, 2^69130921 is an apocalyptic number.

It is an amenable number.

69130921 is a deficient number, since it is larger than the sum of its proper divisors (1304411).

69130921 is a wasteful number, since it uses less digits than its factorization.

69130921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304410.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 69130921 is about 8314.5006464610. The cubic root of 69130921 is about 410.4158402393.

The spelling of 69130921 in words is "sixty-nine million, one hundred thirty thousand, nine hundred twenty-one".