1561164501 has 16 divisors (see below), whose sum is σ = 2250987200. Its totient is φ = 956724480.

The previous prime is 1561164499. The next prime is 1561164533. The reversal of 1561164501 is 1054611651.

It is not a de Polignac number, because 1561164501 - 2¹ = 1561164499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561164571) 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, 73651 + ... + 92448.

It is an arithmetic number, because the mean of its divisors is an integer number (140686700).

Almost surely, 2^1561164501 is an apocalyptic number.

It is an amenable number.

1561164501 is a deficient number, since it is larger than the sum of its proper divisors (689822699).

1561164501 is a wasteful number, since it uses less digits than its factorization.

1561164501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166356.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1561164501 is about 39511.5742662830. The cubic root of 1561164501 is about 1160.0665095139.

The spelling of 1561164501 in words is "one billion, five hundred sixty-one million, one hundred sixty-four thousand, five hundred one".