1561641734 has 8 divisors (see below), whose sum is σ = 2375455248. Its totient is φ = 769823320.

The previous prime is 1561641727. The next prime is 1561641737. The reversal of 1561641734 is 4371461651.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561641737) 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 3 ways as a sum of consecutive naturals, for example, 5498597 + ... + 5498880.

It is an arithmetic number, because the mean of its divisors is an integer number (296931906).

Almost surely, 2^1561641734 is an apocalyptic number.

1561641734 is a deficient number, since it is larger than the sum of its proper divisors (813813514).

1561641734 is a wasteful number, since it uses less digits than its factorization.

1561641734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10997550.

The product of its digits is 60480, while the sum is 38.

The square root of 1561641734 is about 39517.6129592869. The cubic root of 1561641734 is about 1160.1847045360.

The spelling of 1561641734 in words is "one billion, five hundred sixty-one million, six hundred forty-one thousand, seven hundred thirty-four".