901891 has 2 divisors, whose sum is σ = 901892. Its totient is φ = 901890.

The previous prime is 901861. The next prime is 901907. The reversal of 901891 is 198109.

It is a strong prime.

It is an emirp because it is prime and its reverse (198109) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-901891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (901811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450945 + 450946.

It is an arithmetic number, because the mean of its divisors is an integer number (450946).

2⁹⁰¹⁸⁹¹ is an apocalyptic number.

901891 is a deficient number, since it is larger than the sum of its proper divisors (1).

901891 is an equidigital number, since it uses as much as digits as its factorization.

901891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 901891 is about 949.6794195938. The cubic root of 901891 is about 96.6165111725.

The spelling of 901891 in words is "nine hundred one thousand, eight hundred ninety-one".