1561312164 has 48 divisors (see below), whose sum is σ = 3861345600. Its totient is φ = 489317376.

The previous prime is 1561312133. The next prime is 1561312169. The reversal of 1561312164 is 4612131651.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1561312169) 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, 226927 + ... + 233705.

It is an arithmetic number, because the mean of its divisors is an integer number (80444700).

Almost surely, 2^1561312164 is an apocalyptic number.

It is an amenable number.

1561312164 is an abundant number, since it is smaller than the sum of its proper divisors (2300033436).

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

1561312164 is a wasteful number, since it uses less digits than its factorization.

1561312164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7932 (or 7930 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 1561312164 is about 39513.4428264610. The cubic root of 1561312164 is about 1160.1030833878.

The spelling of 1561312164 in words is "one billion, five hundred sixty-one million, three hundred twelve thousand, one hundred sixty-four".