1561400833 has 2 divisors, whose sum is σ = 1561400834. Its totient is φ = 1561400832.

The previous prime is 1561400801. The next prime is 1561400849. The reversal of 1561400833 is 3380041651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930738064 + 630662769 = 30508^2 + 25113^2 .

It is a cyclic number.

It is not a de Polignac number, because 1561400833 - 2⁵ = 1561400801 is a prime.

It is a super-2 number, since 2×1561400833² = 4875945122586187778, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561400795 and 1561400804.

It is not a weakly prime, because it can be changed into another prime (1561400933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780700416 + 780700417.

It is an arithmetic number, because the mean of its divisors is an integer number (780700417).

Almost surely, 2^1561400833 is an apocalyptic number.

It is an amenable number.

1561400833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561400833 is an equidigital number, since it uses as much as digits as its factorization.

1561400833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1561400833 is about 39514.5648210884. The cubic root of 1561400833 is about 1160.1250442391.

The spelling of 1561400833 in words is "one billion, five hundred sixty-one million, four hundred thousand, eight hundred thirty-three".