1561363126 has 4 divisors (see below), whose sum is σ = 2342044692. Its totient is φ = 780681562.

The previous prime is 1561363123. The next prime is 1561363127. The reversal of 1561363126 is 6213631651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6213631651 = 233 ⋅26667947.

It is a super-2 number, since 2×1561363126² = 4875709622464983752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561363091 and 1561363100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561363123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390340780 + ... + 390340783.

It is an arithmetic number, because the mean of its divisors is an integer number (585511173).

Almost surely, 2^1561363126 is an apocalyptic number.

1561363126 is a deficient number, since it is larger than the sum of its proper divisors (780681566).

1561363126 is an equidigital number, since it uses as much as digits as its factorization.

1561363126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780681565.

The product of its digits is 19440, while the sum is 34.

The square root of 1561363126 is about 39514.0876903415. The cubic root of 1561363126 is about 1160.1157053629.

Adding to 1561363126 its reverse (6213631651), we get a palindrome (7774994777).

The spelling of 1561363126 in words is "one billion, five hundred sixty-one million, three hundred sixty-three thousand, one hundred twenty-six".