1309961 has 2 divisors, whose sum is σ = 1309962. Its totient is φ = 1309960.

The previous prime is 1309949. The next prime is 1309963. The reversal of 1309961 is 1699031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 1225 = 1144^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309961 is a prime.

Together with 1309963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1309963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654980 + 654981.

It is an arithmetic number, because the mean of its divisors is an integer number (654981).

2^1309961 is an apocalyptic number.

It is an amenable number.

1309961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309961 is an equidigital number, since it uses as much as digits as its factorization.

1309961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1309961 is about 1144.5352768700. The cubic root of 1309961 is about 109.4173322939.

The spelling of 1309961 in words is "one million, three hundred nine thousand, nine hundred sixty-one".