1311901 has 2 divisors, whose sum is σ = 1311902. Its totient is φ = 1311900.

The previous prime is 1311899. The next prime is 1311917. The reversal of 1311901 is 1091131.

It is a happy number.

It is an a-pointer prime, because the next prime (1311917) can be obtained adding 1311901 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 251001 = 1030^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311901 - 2¹ = 1311899 is a prime.

Together with 1311899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655950 + 655951.

It is an arithmetic number, because the mean of its divisors is an integer number (655951).

2^1311901 is an apocalyptic number.

It is an amenable number.

1311901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311901 is an equidigital number, since it uses as much as digits as its factorization.

1311901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27, while the sum is 16.

The square root of 1311901 is about 1145.3824688723. The cubic root of 1311901 is about 109.4713198867.

The spelling of 1311901 in words is "one million, three hundred eleven thousand, nine hundred one".