1361164661 has 4 divisors (see below), whose sum is σ = 1363385772. Its totient is φ = 1358943552.

The previous prime is 1361164631. The next prime is 1361164663. The reversal of 1361164661 is 1664611631.

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 330112561 + 1031052100 = 18169^2 + 32110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1361164661 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 (1361164663) 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, 1109636 + ... + 1110861.

It is an arithmetic number, because the mean of its divisors is an integer number (340846443).

Almost surely, 2^1361164661 is an apocalyptic number.

It is an amenable number.

1361164661 is a deficient number, since it is larger than the sum of its proper divisors (2221111).

1361164661 is an equidigital number, since it uses as much as digits as its factorization.

1361164661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221110.

The product of its digits is 15552, while the sum is 35.

The square root of 1361164661 is about 36893.9651027102. The cubic root of 1361164661 is about 1108.2478269925.

The spelling of 1361164661 in words is "one billion, three hundred sixty-one million, one hundred sixty-four thousand, six hundred sixty-one".