1561189255 has 8 divisors (see below), whose sum is σ = 1883778624. Its totient is φ = 1242050400.

The previous prime is 1561189243. The next prime is 1561189291. The reversal of 1561189255 is 5529811651.

It is a happy number.

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

It is not a de Polignac number, because 1561189255 - 2¹¹ = 1561187207 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 861631 + ... + 863440.

It is an arithmetic number, because the mean of its divisors is an integer number (235472328).

Almost surely, 2^1561189255 is an apocalyptic number.

1561189255 is a deficient number, since it is larger than the sum of its proper divisors (322589369).

1561189255 is a wasteful number, since it uses less digits than its factorization.

1561189255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725257.

The product of its digits is 108000, while the sum is 43.

The square root of 1561189255 is about 39511.8875150251. The cubic root of 1561189255 is about 1160.0726408632.

The spelling of 1561189255 in words is "one billion, five hundred sixty-one million, one hundred eighty-nine thousand, two hundred fifty-five".