309546421 has 4 divisors (see below), whose sum is σ = 327755052. Its totient is φ = 291337792.

The previous prime is 309546407. The next prime is 309546449. The reversal of 309546421 is 124645903.

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 164608900 + 144937521 = 12830^2 + 12039^2 .

It is a cyclic number.

It is not a de Polignac number, because 309546421 - 2⁹ = 309545909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309546401) 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, 9104290 + ... + 9104323.

It is an arithmetic number, because the mean of its divisors is an integer number (81938763).

Almost surely, 2^309546421 is an apocalyptic number.

It is an amenable number.

309546421 is a deficient number, since it is larger than the sum of its proper divisors (18208631).

309546421 is a wasteful number, since it uses less digits than its factorization.

309546421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18208630.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 309546421 is about 17593.9313685145. The cubic root of 309546421 is about 676.4597005361.

The spelling of 309546421 in words is "three hundred nine million, five hundred forty-six thousand, four hundred twenty-one".