517021742 has 4 divisors (see below), whose sum is σ = 775532616. Its totient is φ = 258510870.

The previous prime is 517021649. The next prime is 517021763. The reversal of 517021742 is 247120715.

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

It is a super-2 number, since 2×517021742² = 534622963401429128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129255434 + ... + 129255437.

It is an arithmetic number, because the mean of its divisors is an integer number (193883154).

Almost surely, 2^517021742 is an apocalyptic number.

517021742 is a deficient number, since it is larger than the sum of its proper divisors (258510874).

517021742 is a wasteful number, since it uses less digits than its factorization.

517021742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258510873.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 517021742 is about 22738.1121028110. The cubic root of 517021742 is about 802.6069859273.

The spelling of 517021742 in words is "five hundred seventeen million, twenty-one thousand, seven hundred forty-two".