783415561 has 4 divisors (see below), whose sum is σ = 783475012. Its totient is φ = 783356112.

The previous prime is 783415559. The next prime is 783415571. The reversal of 783415561 is 165514387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 400000000 + 383415561 = 20000^2 + 19581^2 .

It is a cyclic number.

It is not a de Polignac number, because 783415561 - 2¹ = 783415559 is a prime.

It is a super-2 number, since 2×783415561² = 1227479882433889442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (783415571) 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, 150 + ... + 39583.

It is an arithmetic number, because the mean of its divisors is an integer number (195868753).

Almost surely, 2^783415561 is an apocalyptic number.

It is an amenable number.

783415561 is a deficient number, since it is larger than the sum of its proper divisors (59451).

783415561 is a wasteful number, since it uses less digits than its factorization.

783415561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59450.

The product of its digits is 100800, while the sum is 40.

The square root of 783415561 is about 27989.5616435842. The cubic root of 783415561 is about 921.8580757073.

The spelling of 783415561 in words is "seven hundred eighty-three million, four hundred fifteen thousand, five hundred sixty-one".