1561501140 has 48 divisors (see below), whose sum is σ = 4473889728. Its totient is φ = 406715904.

The previous prime is 1561501133. The next prime is 1561501169. The reversal of 1561501140 is 411051651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561501140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300037 + ... + 305196.

It is an arithmetic number, because the mean of its divisors is an integer number (93206036).

Almost surely, 2^1561501140 is an apocalyptic number.

1561501140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561501140 is an abundant number, since it is smaller than the sum of its proper divisors (2912388588).

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

1561501140 is a wasteful number, since it uses less digits than its factorization.

1561501140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605288 (or 605286 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 1561501140 is about 39515.8340415586. The cubic root of 1561501140 is about 1160.1498864980.

Adding to 1561501140 its reverse (411051651), we get a palindrome (1972552791).

The spelling of 1561501140 in words is "one billion, five hundred sixty-one million, five hundred one thousand, one hundred forty".