191283319551 has 8 divisors (see below), whose sum is σ = 255054091824. Its totient is φ = 127517380160.

The previous prime is 191283319537. The next prime is 191283319567. The reversal of 191283319551 is 155913382191.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 191283319551 - 2¹¹ = 191283317503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191283319551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191283319151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114836 + ... + 1274921.

It is an arithmetic number, because the mean of its divisors is an integer number (31881761478).

Almost surely, 2^191283319551 is an apocalyptic number.

191283319551 is a deficient number, since it is larger than the sum of its proper divisors (63770772273).

191283319551 is a wasteful number, since it uses less digits than its factorization.

191283319551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416441.

The product of its digits is 291600, while the sum is 48.

The spelling of 191283319551 in words is "one hundred ninety-one billion, two hundred eighty-three million, three hundred nineteen thousand, five hundred fifty-one".