1561140534 has 8 divisors (see below), whose sum is σ = 3122281080. Its totient is φ = 520380176.

The previous prime is 1561140533. The next prime is 1561140541. The reversal of 1561140534 is 4350411651.

It is a happy number.

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

1561140534 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561140533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130095039 + ... + 130095050.

It is an arithmetic number, because the mean of its divisors is an integer number (390285135).

Almost surely, 2^1561140534 is an apocalyptic number.

1561140534 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.

1561140534 is a wasteful number, since it uses less digits than its factorization.

1561140534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260190094.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1561140534 is about 39511.2709742423. The cubic root of 1561140534 is about 1160.0605730359.

The spelling of 1561140534 in words is "one billion, five hundred sixty-one million, one hundred forty thousand, five hundred thirty-four".