309481147 has 2 divisors, whose sum is σ = 309481148. Its totient is φ = 309481146.

The previous prime is 309481111. The next prime is 309481201. The reversal of 309481147 is 741184903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309481147 - 2¹⁵ = 309448379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (309481247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154740573 + 154740574.

It is an arithmetic number, because the mean of its divisors is an integer number (154740574).

Almost surely, 2^309481147 is an apocalyptic number.

309481147 is a deficient number, since it is larger than the sum of its proper divisors (1).

309481147 is an equidigital number, since it uses as much as digits as its factorization.

309481147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 309481147 is about 17592.0762560876. The cubic root of 309481147 is about 676.4121488804.

The spelling of 309481147 in words is "three hundred nine million, four hundred eighty-one thousand, one hundred forty-seven".