147670321 has 4 divisors (see below), whose sum is σ = 148977252. Its totient is φ = 146363392.

The previous prime is 147670309. The next prime is 147670331. The reversal of 147670321 is 123076741.

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 54760000 + 92910321 = 7400^2 + 9639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-147670321 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 an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147670331) 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, 653296 + ... + 653521.

It is an arithmetic number, because the mean of its divisors is an integer number (37244313).

Almost surely, 2^147670321 is an apocalyptic number.

147670321 is the 6496-th centered heptagonal number.

It is an amenable number.

147670321 is a deficient number, since it is larger than the sum of its proper divisors (1306931).

147670321 is a wasteful number, since it uses less digits than its factorization.

147670321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306930.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 147670321 is about 12151.9677830383. The cubic root of 147670321 is about 528.5641937964.

The spelling of 147670321 in words is "one hundred forty-seven million, six hundred seventy thousand, three hundred twenty-one".