1561697382 has 16 divisors (see below), whose sum is σ = 3569594112. Its totient is φ = 446199240.

The previous prime is 1561697377. The next prime is 1561697393. The reversal of 1561697382 is 2837961651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18591594 + ... + 18591677.

It is an arithmetic number, because the mean of its divisors is an integer number (223099632).

Almost surely, 2^1561697382 is an apocalyptic number.

1561697382 is an abundant number, since it is smaller than the sum of its proper divisors (2007896730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561697382 is a wasteful number, since it uses less digits than its factorization.

1561697382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37183283.

The product of its digits is 544320, while the sum is 48.

The square root of 1561697382 is about 39518.3170441252. The cubic root of 1561697382 is about 1160.1984851597.

The spelling of 1561697382 in words is "one billion, five hundred sixty-one million, six hundred ninety-seven thousand, three hundred eighty-two".