1561397298 has 8 divisors (see below), whose sum is σ = 3122794608. Its totient is φ = 520465764.

The previous prime is 1561397273. The next prime is 1561397329. The reversal of 1561397298 is 8927931651.

It is a sphenic number, since it is the product of 3 distinct primes.

1561397298 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561397298.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130116436 + ... + 130116447.

It is an arithmetic number, because the mean of its divisors is an integer number (390349326).

Almost surely, 2^1561397298 is an apocalyptic number.

1561397298 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1561397298 is a wasteful number, since it uses less digits than its factorization.

1561397298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260232888.

The product of its digits is 816480, while the sum is 51.

The square root of 1561397298 is about 39514.5200907211. The cubic root of 1561397298 is about 1160.1241687336.

The spelling of 1561397298 in words is "one billion, five hundred sixty-one million, three hundred ninety-seven thousand, two hundred ninety-eight".