1561650601 has 16 divisors (see below), whose sum is σ = 1834586496. Its totient is φ = 1301239296.

The previous prime is 1561650593. The next prime is 1561650611. The reversal of 1561650601 is 1060561651.

It is not a de Polignac number, because 1561650601 - 2³ = 1561650593 is a prime.

It is a super-2 number, since 2×1561650601² = 4877505199207322402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561650611) 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, 429945 + ... + 433561.

It is an arithmetic number, because the mean of its divisors is an integer number (114661656).

Almost surely, 2^1561650601 is an apocalyptic number.

It is an amenable number.

1561650601 is a deficient number, since it is larger than the sum of its proper divisors (272935895).

1561650601 is a wasteful number, since it uses less digits than its factorization.

1561650601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1561650601 is about 39517.7251496085. The cubic root of 1561650601 is about 1160.1869003743.

The spelling of 1561650601 in words is "one billion, five hundred sixty-one million, six hundred fifty thousand, six hundred one".