309461 has 2 divisors, whose sum is σ = 309462. Its totient is φ = 309460.

The previous prime is 309457. The next prime is 309469. The reversal of 309461 is 164903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 28561 = 530^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 309461 - 2² = 309457 is a prime.

It is a super-2 number, since 2×309461² = 191532221042, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309461.

It is not a weakly prime, because it can be changed into another prime (309469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154730 + 154731.

It is an arithmetic number, because the mean of its divisors is an integer number (154731).

2³⁰⁹⁴⁶¹ is an apocalyptic number.

It is an amenable number.

309461 is a deficient number, since it is larger than the sum of its proper divisors (1).

309461 is an equidigital number, since it uses as much as digits as its factorization.

309461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 309461 is about 556.2921894113. The cubic root of 309461 is about 67.6397470580.

The spelling of 309461 in words is "three hundred nine thousand, four hundred sixty-one".