307228121 has 8 divisors (see below), whose sum is σ = 313812360. Its totient is φ = 300673152.

The previous prime is 307228111. The next prime is 307228127. The reversal of 307228121 is 121822703.

It can be written as a sum of positive squares in 4 ways, for example, as 205520896 + 101707225 = 14336^2 + 10085^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-307228121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (307228127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14591 + ... + 28763.

It is an arithmetic number, because the mean of its divisors is an integer number (39226545).

Almost surely, 2^307228121 is an apocalyptic number.

It is an amenable number.

307228121 is a deficient number, since it is larger than the sum of its proper divisors (6584239).

307228121 is a wasteful number, since it uses less digits than its factorization.

307228121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14635.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 307228121 is about 17527.9240356638. The cubic root of 307228121 is about 674.7667203024.

The spelling of 307228121 in words is "three hundred seven million, two hundred twenty-eight thousand, one hundred twenty-one".