1561131334 has 16 divisors (see below), whose sum is σ = 2741499936. Its totient is φ = 652737600.

The previous prime is 1561131331. The next prime is 1561131349. The reversal of 1561131334 is 4331311651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561131331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359297 + ... + 1360444.

It is an arithmetic number, because the mean of its divisors is an integer number (171343746).

Almost surely, 2^1561131334 is an apocalyptic number.

1561131334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1561131334 is a deficient number, since it is larger than the sum of its proper divisors (1180368602).

1561131334 is a wasteful number, since it uses less digits than its factorization.

1561131334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719791.

The product of its digits is 3240, while the sum is 28.

The square root of 1561131334 is about 39511.1545515947. The cubic root of 1561131334 is about 1160.0582942365.

Adding to 1561131334 its reverse (4331311651), we get a palindrome (5892442985).

The spelling of 1561131334 in words is "one billion, five hundred sixty-one million, one hundred thirty-one thousand, three hundred thirty-four".