993851561 has 12 divisors (see below), whose sum is σ = 1045254672. Its totient is φ = 944446608.

The previous prime is 993851557. The next prime is 993851609. The reversal of 993851561 is 165158399.

It is not a de Polignac number, because 993851561 - 2² = 993851557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993859561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50426 + ... + 67308.

It is an arithmetic number, because the mean of its divisors is an integer number (87104556).

Almost surely, 2^993851561 is an apocalyptic number.

It is an amenable number.

993851561 is a deficient number, since it is larger than the sum of its proper divisors (51403111).

993851561 is a wasteful number, since it uses less digits than its factorization.

993851561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000 (or 16963 counting only the distinct ones).

The product of its digits is 291600, while the sum is 47.

The square root of 993851561 is about 31525.4113533828. The cubic root of 993851561 is about 997.9463055597.

The spelling of 993851561 in words is "nine hundred ninety-three million, eight hundred fifty-one thousand, five hundred sixty-one".