1561881102 has 32 divisors (see below), whose sum is σ = 3265470720. Its totient is φ = 497090880.

The previous prime is 1561881089. The next prime is 1561881107. The reversal of 1561881102 is 2011881651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561881107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68577 + ... + 88467.

It is an arithmetic number, because the mean of its divisors is an integer number (102045960).

Almost surely, 2^1561881102 is an apocalyptic number.

1561881102 is an abundant number, since it is smaller than the sum of its proper divisors (1703589618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561881102 is a wasteful number, since it uses less digits than its factorization.

1561881102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20488.

The product of its (nonzero) digits is 3840, while the sum is 33.

The square root of 1561881102 is about 39520.6414674661. The cubic root of 1561881102 is about 1160.2439791012.

The spelling of 1561881102 in words is "one billion, five hundred sixty-one million, eight hundred eighty-one thousand, one hundred two".