1561173433 has 2 divisors, whose sum is σ = 1561173434. Its totient is φ = 1561173432.

The previous prime is 1561173421. The next prime is 1561173457. The reversal of 1561173433 is 3343711651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1531000384 + 30173049 = 39128^2 + 5493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561173433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561173233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780586716 + 780586717.

It is an arithmetic number, because the mean of its divisors is an integer number (780586717).

Almost surely, 2^1561173433 is an apocalyptic number.

It is an amenable number.

1561173433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561173433 is an equidigital number, since it uses as much as digits as its factorization.

1561173433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 1561173433 is about 39511.6872962925. The cubic root of 1561173433 is about 1160.0687218997.

The spelling of 1561173433 in words is "one billion, five hundred sixty-one million, one hundred seventy-three thousand, four hundred thirty-three".