1561761734 has 16 divisors (see below), whose sum is σ = 2655628080. Its totient is φ = 682875360.

The previous prime is 1561761727. The next prime is 1561761767. The reversal of 1561761734 is 4371671651.

It is a junction number, because it is equal to n+sod(n) for n = 1561761691 and 1561761700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580237 + ... + 1581224.

It is an arithmetic number, because the mean of its divisors is an integer number (165976755).

Almost surely, 2^1561761734 is an apocalyptic number.

1561761734 is a deficient number, since it is larger than the sum of its proper divisors (1093866346).

1561761734 is a wasteful number, since it uses less digits than its factorization.

1561761734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161495.

The product of its digits is 105840, while the sum is 41.

The square root of 1561761734 is about 39519.1312404511. The cubic root of 1561761734 is about 1160.2144208266.

The spelling of 1561761734 in words is "one billion, five hundred sixty-one million, seven hundred sixty-one thousand, seven hundred thirty-four".