493721551 has 4 divisors (see below), whose sum is σ = 494170272. Its totient is φ = 493272832.

The previous prime is 493721489. The next prime is 493721567. The reversal of 493721551 is 155127394.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 493721551 - 2¹³ = 493713359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 493721551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493721581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222706 + ... + 224911.

It is an arithmetic number, because the mean of its divisors is an integer number (123542568).

Almost surely, 2^493721551 is an apocalyptic number.

493721551 is a deficient number, since it is larger than the sum of its proper divisors (448721).

493721551 is a wasteful number, since it uses less digits than its factorization.

493721551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448720.

The product of its digits is 37800, while the sum is 37.

The square root of 493721551 is about 22219.8458815537. The cubic root of 493721551 is about 790.3643840587.

The spelling of 493721551 in words is "four hundred ninety-three million, seven hundred twenty-one thousand, five hundred fifty-one".