1561422239 has 16 divisors (see below), whose sum is σ = 1788145632. Its totient is φ = 1350663168.

The previous prime is 1561422211. The next prime is 1561422251. The reversal of 1561422239 is 9322241651.

It is a cyclic number.

It is not a de Polignac number, because 1561422239 - 2¹² = 1561418143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1561422199 and 1561422208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561422259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36332 + ... + 66654.

It is an arithmetic number, because the mean of its divisors is an integer number (111759102).

Almost surely, 2^1561422239 is an apocalyptic number.

1561422239 is a deficient number, since it is larger than the sum of its proper divisors (226723393).

1561422239 is a wasteful number, since it uses less digits than its factorization.

1561422239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30586.

The product of its digits is 25920, while the sum is 35.

The square root of 1561422239 is about 39514.8356823105. The cubic root of 1561422239 is about 1160.1303457869.

The spelling of 1561422239 in words is "one billion, five hundred sixty-one million, four hundred twenty-two thousand, two hundred thirty-nine".