1561189234 has 16 divisors (see below), whose sum is σ = 2555465760. Its totient is φ = 709411360.

The previous prime is 1561189229. The next prime is 1561189243. The reversal of 1561189234 is 4329811651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77262 + ... + 95350.

It is an arithmetic number, because the mean of its divisors is an integer number (159716610).

Almost surely, 2^1561189234 is an apocalyptic number.

1561189234 is a deficient number, since it is larger than the sum of its proper divisors (994276526).

1561189234 is a wasteful number, since it uses less digits than its factorization.

1561189234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22025.

The product of its digits is 51840, while the sum is 40.

The square root of 1561189234 is about 39511.8872492823. The cubic root of 1561189234 is about 1160.0726356617.

The spelling of 1561189234 in words is "one billion, five hundred sixty-one million, one hundred eighty-nine thousand, two hundred thirty-four".