1561593498 has 16 divisors (see below), whose sum is σ = 3125135520. Its totient is φ = 520206416.

The previous prime is 1561593437. The next prime is 1561593499. The reversal of 1561593498 is 8943951651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561593498.

It is not an unprimeable number, because it can be changed into a prime (1561593499) 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 in 7 ways as a sum of consecutive naturals, for example, 70665 + ... + 90092.

It is an arithmetic number, because the mean of its divisors is an integer number (195320970).

Almost surely, 2^1561593498 is an apocalyptic number.

1561593498 is an abundant number, since it is smaller than the sum of its proper divisors (1563542022).

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

1561593498 is a wasteful number, since it uses less digits than its factorization.

1561593498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162381.

The product of its digits is 1166400, while the sum is 51.

The square root of 1561593498 is about 39517.0026444314. The cubic root of 1561593498 is about 1160.1727591488.

The spelling of 1561593498 in words is "one billion, five hundred sixty-one million, five hundred ninety-three thousand, four hundred ninety-eight".