193661457 has 8 divisors (see below), whose sum is σ = 281689440. Its totient is φ = 117370560.

The previous prime is 193661453. The next prime is 193661477. The reversal of 193661457 is 754166391.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 193661457 - 2² = 193661453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (193661453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2934232 + ... + 2934297.

It is an arithmetic number, because the mean of its divisors is an integer number (35211180).

Almost surely, 2^193661457 is an apocalyptic number.

It is an amenable number.

193661457 is a deficient number, since it is larger than the sum of its proper divisors (88027983).

193661457 is a wasteful number, since it uses less digits than its factorization.

193661457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868543.

The product of its digits is 136080, while the sum is 42.

The square root of 193661457 is about 13916.2299851648. The cubic root of 193661457 is about 578.5591036807.

The spelling of 193661457 in words is "one hundred ninety-three million, six hundred sixty-one thousand, four hundred fifty-seven".