79661143 has 2 divisors, whose sum is σ = 79661144. Its totient is φ = 79661142.

The previous prime is 79661081. The next prime is 79661147. The reversal of 79661143 is 34116697.

It is a strong prime.

It is an emirp because it is prime and its reverse (34116697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79661143 - 2¹⁷ = 79530071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79661147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39830571 + 39830572.

It is an arithmetic number, because the mean of its divisors is an integer number (39830572).

Almost surely, 2^79661143 is an apocalyptic number.

79661143 is a deficient number, since it is larger than the sum of its proper divisors (1).

79661143 is an equidigital number, since it uses as much as digits as its factorization.

79661143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 79661143 is about 8925.3091262992. The cubic root of 79661143 is about 430.2777059546.

The spelling of 79661143 in words is "seventy-nine million, six hundred sixty-one thousand, one hundred forty-three".