1956109 has 2 divisors, whose sum is σ = 1956110. Its totient is φ = 1956108.

The previous prime is 1956091. The next prime is 1956161. The reversal of 1956109 is 9016591.

Together with previous prime (1956091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1258884 + 697225 = 1122^2 + 835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1956109 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1956169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978054 + 978055.

It is an arithmetic number, because the mean of its divisors is an integer number (978055).

2^1956109 is an apocalyptic number.

It is an amenable number.

1956109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956109 is an equidigital number, since it uses as much as digits as its factorization.

1956109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1956109 is about 1398.6096667763. The cubic root of 1956109 is about 125.0636262747.

The spelling of 1956109 in words is "one million, nine hundred fifty-six thousand, one hundred nine".