71501230621 has 2 divisors, whose sum is σ = 71501230622. Its totient is φ = 71501230620.

The previous prime is 71501230601. The next prime is 71501230627. The reversal of 71501230621 is 12603210517.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42324832900 + 29176397721 = 205730^2 + 170811^2 .

It is a cyclic number.

It is not a de Polignac number, because 71501230621 - 2¹¹ = 71501228573 is a prime.

It is a super-2 number, since 2×71501230621² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71501230621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71501230627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35750615310 + 35750615311.

It is an arithmetic number, because the mean of its divisors is an integer number (35750615311).

Almost surely, 2^71501230621 is an apocalyptic number.

It is an amenable number.

71501230621 is a deficient number, since it is larger than the sum of its proper divisors (1).

71501230621 is an equidigital number, since it uses as much as digits as its factorization.

71501230621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 71501230621 in words is "seventy-one billion, five hundred one million, two hundred thirty thousand, six hundred twenty-one".