780142561 has 4 divisors (see below), whose sum is σ = 851064624. Its totient is φ = 709220500.

The previous prime is 780142553. The next prime is 780142591. The reversal of 780142561 is 165241087.

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 780142561 - 2³ = 780142553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780142591) 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, 35461015 + ... + 35461036.

It is an arithmetic number, because the mean of its divisors is an integer number (212766156).

Almost surely, 2^780142561 is an apocalyptic number.

It is an amenable number.

780142561 is a deficient number, since it is larger than the sum of its proper divisors (70922063).

780142561 is a wasteful number, since it uses less digits than its factorization.

780142561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70922062.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 780142561 is about 27931.0322222434. The cubic root of 780142561 is about 920.5724859206.

It can be divided in two parts, 780 and 142561, that added together give a palindrome (143341).

The spelling of 780142561 in words is "seven hundred eighty million, one hundred forty-two thousand, five hundred sixty-one".