1161640801 has 4 divisors (see below), whose sum is σ = 1166269104. Its totient is φ = 1157012500.

The previous prime is 1161640769. The next prime is 1161640819. The reversal of 1161640801 is 1080461611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1080461611 = 1307 ⋅826673.

It is a cyclic number.

It is not a de Polignac number, because 1161640801 - 2⁵ = 1161640769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161640801.

It is not an unprimeable number, because it can be changed into a prime (1161640891) 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, 2313775 + ... + 2314276.

It is an arithmetic number, because the mean of its divisors is an integer number (291567276).

Almost surely, 2^1161640801 is an apocalyptic number.

It is an amenable number.

1161640801 is a deficient number, since it is larger than the sum of its proper divisors (4628303).

1161640801 is an equidigital number, since it uses as much as digits as its factorization.

1161640801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4628302.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 1161640801 is about 34082.8520080113. The cubic root of 1161640801 is about 1051.2127486997.

The spelling of 1161640801 in words is "one billion, one hundred sixty-one million, six hundred forty thousand, eight hundred one".