1915961 has 2 divisors, whose sum is σ = 1915962. Its totient is φ = 1915960.

The previous prime is 1915957. The next prime is 1915981. The reversal of 1915961 is 1695191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1771561 + 144400 = 1331^2 + 380^2 .

It is an emirp because it is prime and its reverse (1695191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1915961 - 2² = 1915957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1915931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957980 + 957981.

It is an arithmetic number, because the mean of its divisors is an integer number (957981).

2^1915961 is an apocalyptic number.

It is an amenable number.

1915961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915961 is an equidigital number, since it uses as much as digits as its factorization.

1915961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 32.

The square root of 1915961 is about 1384.1824301731. The cubic root of 1915961 is about 124.2020854970.

The spelling of 1915961 in words is "one million, nine hundred fifteen thousand, nine hundred sixty-one".