1010161561 has 4 divisors (see below), whose sum is σ = 1013756724. Its totient is φ = 1006566400.

The previous prime is 1010161549. The next prime is 1010161571. The reversal of 1010161561 is 1651610101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 693321561 + 316840000 = 26331^2 + 17800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010161561 - 2²⁵ = 976607129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1010161501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1797160 + ... + 1797721.

It is an arithmetic number, because the mean of its divisors is an integer number (253439181).

Almost surely, 2^1010161561 is an apocalyptic number.

It is an amenable number.

1010161561 is a deficient number, since it is larger than the sum of its proper divisors (3595163).

1010161561 is an equidigital number, since it uses as much as digits as its factorization.

1010161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595162.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 1010161561 is about 31783.0388886903. The cubic root of 1010161561 is about 1003.3757782976.

Adding to 1010161561 its reverse (1651610101), we get a palindrome (2661771662).

The spelling of 1010161561 in words is "one billion, ten million, one hundred sixty-one thousand, five hundred sixty-one".