73071997 has 2 divisors, whose sum is σ = 73071998. Its totient is φ = 73071996.

The previous prime is 73071983. The next prime is 73072057. The reversal of 73071997 is 79917037.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68657796 + 4414201 = 8286^2 + 2101^2 .

It is a cyclic number.

It is not a de Polignac number, because 73071997 - 2¹¹ = 73069949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73071197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36535998 + 36535999.

It is an arithmetic number, because the mean of its divisors is an integer number (36535999).

Almost surely, 2^73071997 is an apocalyptic number.

It is an amenable number.

73071997 is a deficient number, since it is larger than the sum of its proper divisors (1).

73071997 is an equidigital number, since it uses as much as digits as its factorization.

73071997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 73071997 is about 8548.2160127128. The cubic root of 73071997 is about 418.0712717004.

It can be divided in two parts, 730 and 71997, that added together give a palindrome (72727).

The spelling of 73071997 in words is "seventy-three million, seventy-one thousand, nine hundred ninety-seven".