72170801 has 2 divisors, whose sum is σ = 72170802. Its totient is φ = 72170800.

The previous prime is 72170779. The next prime is 72170807. The reversal of 72170801 is 10807127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 5776 = 8495^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 72170801 - 2⁶ = 72170737 is a prime.

It is equal to p_4238153 and since 72170801 and 4238153 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72170807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36085400 + 36085401.

It is an arithmetic number, because the mean of its divisors is an integer number (36085401).

Almost surely, 2^72170801 is an apocalyptic number.

It is an amenable number.

72170801 is a deficient number, since it is larger than the sum of its proper divisors (1).

72170801 is an equidigital number, since it uses as much as digits as its factorization.

72170801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 72170801 is about 8495.3399578828. The cubic root of 72170801 is about 416.3454681570.

Adding to 72170801 its reverse (10807127), we get a palindrome (82977928).

The spelling of 72170801 in words is "seventy-two million, one hundred seventy thousand, eight hundred one".