909941897861 has 4 divisors (see below), whose sum is σ = 909944000652. Its totient is φ = 909939795072.

The previous prime is 909941897801. The next prime is 909941897929. The reversal of 909941897861 is 168798149909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 437821745761 + 472120152100 = 661681^2 + 687110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-909941897861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909941897801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137516 + ... + 1356021.

It is an arithmetic number, because the mean of its divisors is an integer number (227486000163).

Almost surely, 2^909941897861 is an apocalyptic number.

It is an amenable number.

909941897861 is a deficient number, since it is larger than the sum of its proper divisors (2102791).

909941897861 is a wasteful number, since it uses less digits than its factorization.

909941897861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102790.

The product of its (nonzero) digits is 70543872, while the sum is 71.

The spelling of 909941897861 in words is "nine hundred nine billion, nine hundred forty-one million, eight hundred ninety-seven thousand, eight hundred sixty-one".