193990917136 has 45 divisors (see below), whose sum is σ = 378909596541. Its totient is φ = 96214110912.

The previous prime is 193990917121. The next prime is 193990917137. The reversal of 193990917136 is 631719099391.

The square root of 193990917136 is 440444.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 22727371536 + 171263545600 = 150756^2 + 413840^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193990917137) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 262504255 + ... + 262504993.

Almost surely, 2^193990917136 is an apocalyptic number.

193990917136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

193990917136 is the 440444-th square number.

It is an amenable number.

193990917136 is a deficient number, since it is larger than the sum of its proper divisors (184918679405).

193990917136 is an frugal number, since it uses more digits than its factorization.

193990917136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 890 counting only the distinct ones).

The product of its (nonzero) digits is 2480058, while the sum is 58.

The spelling of 193990917136 in words is "one hundred ninety-three billion, nine hundred ninety million, nine hundred seventeen thousand, one hundred thirty-six".