409861889261 has 6 divisors (see below), whose sum is σ = 450509349486. Its totient is φ = 372601717400.

The previous prime is 409861889237. The next prime is 409861889287. The reversal of 409861889261 is 162988168904.

It can be written as a sum of positive squares in only one way, i.e., 262026253225 + 147835636036 = 511885^2 + 384494^2 .

It is not a de Polignac number, because 409861889261 - 2¹⁴ = 409861872877 is a prime.

It is a super-2 number, since 2×409861889261² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 409861889194 and 409861889203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409861889231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1693644050 + ... + 1693644291.

It is an arithmetic number, because the mean of its divisors is an integer number (75084891581).

Almost surely, 2^409861889261 is an apocalyptic number.

It is an amenable number.

409861889261 is a deficient number, since it is larger than the sum of its proper divisors (40647460225).

409861889261 is a wasteful number, since it uses less digits than its factorization.

409861889261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387288363 (or 3387288352 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 62.

The spelling of 409861889261 in words is "four hundred nine billion, eight hundred sixty-one million, eight hundred eighty-nine thousand, two hundred sixty-one".