193007681 has 16 divisors (see below), whose sum is σ = 215732160. Its totient is φ = 171601920.

The previous prime is 193007657. The next prime is 193007687. The reversal of 193007681 is 186700391.

It is not a de Polignac number, because 193007681 - 2¹⁸ = 192745537 is a prime.

It is a super-2 number, since 2×193007681² = 74503929849995522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (193007687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157985 + ... + 159201.

It is an arithmetic number, because the mean of its divisors is an integer number (13483260).

Almost surely, 2^193007681 is an apocalyptic number.

It is an amenable number.

193007681 is a deficient number, since it is larger than the sum of its proper divisors (22724479).

193007681 is a wasteful number, since it uses less digits than its factorization.

193007681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 193007681 is about 13892.7204319384. The cubic root of 193007681 is about 577.9073228164.

The spelling of 193007681 in words is "one hundred ninety-three million, seven thousand, six hundred eighty-one".