1561220434 has 8 divisors (see below), whose sum is σ = 2342247408. Its totient is φ = 780471300.

The previous prime is 1561220411. The next prime is 1561220477. The reversal of 1561220434 is 4340221651.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54792 + ... + 78259.

It is an arithmetic number, because the mean of its divisors is an integer number (292780926).

Almost surely, 2^1561220434 is an apocalyptic number.

1561220434 is a deficient number, since it is larger than the sum of its proper divisors (781026974).

1561220434 is a wasteful number, since it uses less digits than its factorization.

1561220434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138920.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1561220434 is about 39512.2820652009. The cubic root of 1561220434 is about 1160.0803635366.

It can be divided in two parts, 15612 and 20434, that added together give a triangular number (36046 = T₂₆₈).

The spelling of 1561220434 in words is "one billion, five hundred sixty-one million, two hundred twenty thousand, four hundred thirty-four".