901861 has 2 divisors, whose sum is σ = 901862. Its totient is φ = 901860.

The previous prime is 901841. The next prime is 901891. The reversal of 901861 is 168109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 8836 = 945^2 + 94^2 .

It is an emirp because it is prime and its reverse (168109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 901861 - 2¹⁷ = 770789 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 (901811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450930 + 450931.

It is an arithmetic number, because the mean of its divisors is an integer number (450931).

2⁹⁰¹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

901861 is a deficient number, since it is larger than the sum of its proper divisors (1).

901861 is an equidigital number, since it uses as much as digits as its factorization.

901861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 901861 is about 949.6636246588. The cubic root of 901861 is about 96.6154398947.

The spelling of 901861 in words is "nine hundred one thousand, eight hundred sixty-one".