771856142 has 4 divisors (see below), whose sum is σ = 1157784216. Its totient is φ = 385928070.

The previous prime is 771856121. The next prime is 771856159. The reversal of 771856142 is 241658177.

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

It is a self number, because there is not a number n which added to its sum of digits gives 771856142.

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, 192964034 + ... + 192964037.

It is an arithmetic number, because the mean of its divisors is an integer number (289446054).

Almost surely, 2^771856142 is an apocalyptic number.

771856142 is a deficient number, since it is larger than the sum of its proper divisors (385928074).

771856142 is a wasteful number, since it uses less digits than its factorization.

771856142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385928073.

The product of its digits is 94080, while the sum is 41.

The square root of 771856142 is about 27782.2990769303. The cubic root of 771856142 is about 917.3015375546.

The spelling of 771856142 in words is "seven hundred seventy-one million, eight hundred fifty-six thousand, one hundred forty-two".