946821173409 has 20 divisors (see below), whose sum is σ = 1416161920404. Its totient is φ = 630422085024.

The previous prime is 946821173387. The next prime is 946821173443. The reversal of 946821173409 is 904371128649.

946821173409 is a `hidden beast` number, since 9 + 4 + 68 + 2 + 1 + 173 + 409 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 600191078400 + 346630095009 = 774720^2 + 588753^2 .

It is not a de Polignac number, because 946821173409 - 2⁸ = 946821173153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (946821173209) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7268662 + ... + 7397775.

Almost surely, 2^946821173409 is an apocalyptic number.

It is an amenable number.

946821173409 is a deficient number, since it is larger than the sum of its proper divisors (469340746995).

946821173409 is a wasteful number, since it uses less digits than its factorization.

946821173409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14667246 (or 14667237 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 946821173409 in words is "nine hundred forty-six billion, eight hundred twenty-one million, one hundred seventy-three thousand, four hundred nine".