781133042 has 4 divisors (see below), whose sum is σ = 1171699566. Its totient is φ = 390566520.

The previous prime is 781133039. The next prime is 781133047. The reversal of 781133042 is 240331187.

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

It can be written as a sum of positive squares in only one way, i.e., 727974361 + 53158681 = 26981^2 + 7291^2 .

It is a super-2 number, since 2×781133042² = 1220337658608347528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781132996 and 781133014.

It is not an unprimeable number, because it can be changed into a prime (781133047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195283259 + ... + 195283262.

Almost surely, 2^781133042 is an apocalyptic number.

781133042 is a deficient number, since it is larger than the sum of its proper divisors (390566524).

781133042 is a wasteful number, since it uses less digits than its factorization.

781133042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390566523.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 781133042 is about 27948.7574321293. The cubic root of 781133042 is about 920.9619121578.

The spelling of 781133042 in words is "seven hundred eighty-one million, one hundred thirty-three thousand, forty-two".