782141021 has 4 divisors (see below), whose sum is σ = 782209212. Its totient is φ = 782072832.

The previous prime is 782141011. The next prime is 782141029. The reversal of 782141021 is 120141287.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 390655225 + 391485796 = 19765^2 + 19786^2 .

It is a cyclic number.

It is not a de Polignac number, because 782141021 - 2²² = 777946717 is a prime.

It is a super-2 number, since 2×782141021² = 1223489153461844882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (782141029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12206 + ... + 41391.

It is an arithmetic number, because the mean of its divisors is an integer number (195552303).

Almost surely, 2^782141021 is an apocalyptic number.

It is an amenable number.

782141021 is a deficient number, since it is larger than the sum of its proper divisors (68191).

782141021 is a wasteful number, since it uses less digits than its factorization.

782141021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68190.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 782141021 is about 27966.7842448859. The cubic root of 782141021 is about 921.3578802384.

The spelling of 782141021 in words is "seven hundred eighty-two million, one hundred forty-one thousand, twenty-one".