873240661 has 2 divisors, whose sum is σ = 873240662. Its totient is φ = 873240660.

The previous prime is 873240623. The next prime is 873240671. The reversal of 873240661 is 166042378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444999025 + 428241636 = 21095^2 + 20694^2 .

It is a cyclic number.

It is not a de Polignac number, because 873240661 - 2²¹ = 871143509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 873240661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (873240611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436620330 + 436620331.

It is an arithmetic number, because the mean of its divisors is an integer number (436620331).

Almost surely, 2^873240661 is an apocalyptic number.

It is an amenable number.

873240661 is a deficient number, since it is larger than the sum of its proper divisors (1).

873240661 is an equidigital number, since it uses as much as digits as its factorization.

873240661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 873240661 is about 29550.6456951451. The cubic root of 873240661 is about 955.8241147017.

The spelling of 873240661 in words is "eight hundred seventy-three million, two hundred forty thousand, six hundred sixty-one".