1561922116 has 12 divisors (see below), whose sum is σ = 2743233388. Its totient is φ = 778141152.

The previous prime is 1561922099. The next prime is 1561922147. The reversal of 1561922116 is 6112291651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 312582400 + 1249339716 = 17680^2 + 35346^2 .

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, 703731 + ... + 705946.

Almost surely, 2^1561922116 is an apocalyptic number.

It is an amenable number.

1561922116 is a deficient number, since it is larger than the sum of its proper divisors (1181311272).

1561922116 is a wasteful number, since it uses less digits than its factorization.

1561922116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409958 (or 1409956 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 1561922116 is about 39521.1603574591. The cubic root of 1561922116 is about 1160.2541347675.

The spelling of 1561922116 in words is "one billion, five hundred sixty-one million, nine hundred twenty-two thousand, one hundred sixteen".