72021149 has 2 divisors, whose sum is σ = 72021150. Its totient is φ = 72021148.

The previous prime is 72021139. The next prime is 72021151. The reversal of 72021149 is 94112027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 7941124 = 8005^2 + 2818^2 .

It is a cyclic number.

It is not a de Polignac number, because 72021149 - 2¹² = 72017053 is a prime.

It is a Sophie Germain prime.

Together with 72021151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72021109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36010574 + 36010575.

It is an arithmetic number, because the mean of its divisors is an integer number (36010575).

Almost surely, 2^72021149 is an apocalyptic number.

It is an amenable number.

72021149 is a deficient number, since it is larger than the sum of its proper divisors (1).

72021149 is an equidigital number, since it uses as much as digits as its factorization.

72021149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 72021149 is about 8486.5274995136. The cubic root of 72021149 is about 416.0574936716.

The spelling of 72021149 in words is "seventy-two million, twenty-one thousand, one hundred forty-nine".