1201691 has 2 divisors, whose sum is σ = 1201692. Its totient is φ = 1201690.

The previous prime is 1201687. The next prime is 1201699. The reversal of 1201691 is 1961021.

It is a weak prime.

It is an emirp because it is prime and its reverse (1961021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201691 - 2² = 1201687 is a prime.

It is a super-2 number, since 2×1201691² = 2888122518962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1201699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600845 + 600846.

It is an arithmetic number, because the mean of its divisors is an integer number (600846).

2^1201691 is an apocalyptic number.

1201691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201691 is an equidigital number, since it uses as much as digits as its factorization.

1201691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1201691 is about 1096.2166756623. The cubic root of 1201691 is about 106.3157489247.

The spelling of 1201691 in words is "one million, two hundred one thousand, six hundred ninety-one".