780531081 has 32 divisors (see below), whose sum is σ = 1213429248. Its totient is φ = 441027840.

The previous prime is 780531071. The next prime is 780531109. The reversal of 780531081 is 180135087.

It is not a de Polignac number, because 780531081 - 2¹⁴ = 780514697 is a prime.

It is a super-2 number, since 2×780531081² = 1218457536814057122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (780531071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53526 + ... + 66528.

It is an arithmetic number, because the mean of its divisors is an integer number (37919664).

Almost surely, 2^780531081 is an apocalyptic number.

It is an amenable number.

780531081 is a deficient number, since it is larger than the sum of its proper divisors (432898167).

780531081 is a wasteful number, since it uses less digits than its factorization.

780531081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13141.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 780531081 is about 27937.9863447601. The cubic root of 780531081 is about 920.7252791337.

The spelling of 780531081 in words is "seven hundred eighty million, five hundred thirty-one thousand, eighty-one".