781332113 has 4 divisors (see below), whose sum is σ = 782384448. Its totient is φ = 780279780.

The previous prime is 781332109. The next prime is 781332119. The reversal of 781332113 is 311233187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 781332113 - 2² = 781332109 is a prime.

It is a super-2 number, since 2×781332113² = 1220959741610089538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (781332119) 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, 525053 + ... + 526538.

It is an arithmetic number, because the mean of its divisors is an integer number (195596112).

Almost surely, 2^781332113 is an apocalyptic number.

It is an amenable number.

781332113 is a deficient number, since it is larger than the sum of its proper divisors (1052335).

781332113 is a wasteful number, since it uses less digits than its factorization.

781332113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052334.

The product of its digits is 3024, while the sum is 29.

The square root of 781332113 is about 27952.3185621515. The cubic root of 781332113 is about 921.0401409300.

The spelling of 781332113 in words is "seven hundred eighty-one million, three hundred thirty-two thousand, one hundred thirteen".