72091069 has 2 divisors, whose sum is σ = 72091070. Its totient is φ = 72091068.

The previous prime is 72091051. The next prime is 72091093. The reversal of 72091069 is 96019027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71064900 + 1026169 = 8430^2 + 1013^2 .

It is a cyclic number.

It is not a de Polignac number, because 72091069 - 2⁵ = 72091037 is a prime.

It is a super-2 number, since 2×72091069² = 10394244459125522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72091009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36045534 + 36045535.

It is an arithmetic number, because the mean of its divisors is an integer number (36045535).

Almost surely, 2^72091069 is an apocalyptic number.

It is an amenable number.

72091069 is a deficient number, since it is larger than the sum of its proper divisors (1).

72091069 is an equidigital number, since it uses as much as digits as its factorization.

72091069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 72091069 is about 8490.6459707139. The cubic root of 72091069 is about 416.1920899276.

The spelling of 72091069 in words is "seventy-two million, ninety-one thousand, sixty-nine".