1561151000 has 32 divisors (see below), whose sum is σ = 3653095680. Its totient is φ = 624460000.

The previous prime is 1561150963. The next prime is 1561151057. The reversal of 1561151000 is 1511651.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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, 779576 + ... + 781575.

It is an arithmetic number, because the mean of its divisors is an integer number (114159240).

Almost surely, 2^1561151000 is an apocalyptic number.

1561151000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561151000 is an abundant number, since it is smaller than the sum of its proper divisors (2091944680).

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

1561151000 is a wasteful number, since it uses less digits than its factorization.

1561151000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561172 (or 1561158 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1561151000 is about 39511.4034172415. The cubic root of 1561151000 is about 1160.0631654070.

Adding to 1561151000 its reverse (1511651), we get a palindrome (1562662651).

The spelling of 1561151000 in words is "one billion, five hundred sixty-one million, one hundred fifty-one thousand".