72054991 has 2 divisors, whose sum is σ = 72054992. Its totient is φ = 72054990.

The previous prime is 72054979. The next prime is 72055001. The reversal of 72054991 is 19945027.

It is a strong prime.

It is an emirp because it is prime and its reverse (19945027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72054991 - 2²⁵ = 38500559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72054991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72054911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36027495 + 36027496.

It is an arithmetic number, because the mean of its divisors is an integer number (36027496).

Almost surely, 2^72054991 is an apocalyptic number.

72054991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72054991 is an equidigital number, since it uses as much as digits as its factorization.

72054991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 72054991 is about 8488.5211315046. The cubic root of 72054991 is about 416.1226505183.

The spelling of 72054991 in words is "seventy-two million, fifty-four thousand, nine hundred ninety-one".