781001049 has 4 divisors (see below), whose sum is σ = 1041334736. Its totient is φ = 520667364.

The previous prime is 781001047. The next prime is 781001071. The reversal of 781001049 is 940100187.

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 not a de Polignac number, because 781001049 - 2¹ = 781001047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781001047) 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, 130166839 + ... + 130166844.

It is an arithmetic number, because the mean of its divisors is an integer number (260333684).

Almost surely, 2^781001049 is an apocalyptic number.

It is an amenable number.

781001049 is a deficient number, since it is larger than the sum of its proper divisors (260333687).

781001049 is a wasteful number, since it uses less digits than its factorization.

781001049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260333686.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 781001049 is about 27946.3959930435. The cubic root of 781001049 is about 920.9100356456.

The spelling of 781001049 in words is "seven hundred eighty-one million, one thousand, forty-nine".