401746861 has 2 divisors, whose sum is σ = 401746862. Its totient is φ = 401746860.

The previous prime is 401746843. The next prime is 401746867. The reversal of 401746861 is 168647104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279224100 + 122522761 = 16710^2 + 11069^2 .

It is a cyclic number.

It is not a de Polignac number, because 401746861 - 2¹⁹ = 401222573 is a prime.

It is a super-3 number, since 3×401746861³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 401746861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401746867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200873430 + 200873431.

It is an arithmetic number, because the mean of its divisors is an integer number (200873431).

Almost surely, 2^401746861 is an apocalyptic number.

It is an amenable number.

401746861 is a deficient number, since it is larger than the sum of its proper divisors (1).

401746861 is an equidigital number, since it uses as much as digits as its factorization.

401746861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 401746861 is about 20043.6239487773. The cubic root of 401746861 is about 737.8773239538.

The spelling of 401746861 in words is "four hundred one million, seven hundred forty-six thousand, eight hundred sixty-one".