79121011 has 2 divisors, whose sum is σ = 79121012. Its totient is φ = 79121010.

The previous prime is 79120963. The next prime is 79121033. The reversal of 79121011 is 11012197.

It is an a-pointer prime, because the next prime (79121033) can be obtained adding 79121011 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79121011 is a prime.

It is not a weakly prime, because it can be changed into another prime (79121041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39560505 + 39560506.

It is an arithmetic number, because the mean of its divisors is an integer number (39560506).

Almost surely, 2^79121011 is an apocalyptic number.

79121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

79121011 is an equidigital number, since it uses as much as digits as its factorization.

79121011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 79121011 is about 8894.9992130410. Note that the first 3 decimals coincide. The cubic root of 79121011 is about 429.3030190721.

The spelling of 79121011 in words is "seventy-nine million, one hundred twenty-one thousand, eleven".