147237521 has 2 divisors, whose sum is σ = 147237522. Its totient is φ = 147237520.

The previous prime is 147237499. The next prime is 147237617. The reversal of 147237521 is 125732741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140161921 + 7075600 = 11839^2 + 2660^2 .

It is an emirp because it is prime and its reverse (125732741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147237521 - 2¹⁰ = 147236497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (147233521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73618760 + 73618761.

It is an arithmetic number, because the mean of its divisors is an integer number (73618761).

Almost surely, 2^147237521 is an apocalyptic number.

It is an amenable number.

147237521 is a deficient number, since it is larger than the sum of its proper divisors (1).

147237521 is an equidigital number, since it uses as much as digits as its factorization.

147237521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 32.

The square root of 147237521 is about 12134.1469003799. The cubic root of 147237521 is about 528.0473071804.

The spelling of 147237521 in words is "one hundred forty-seven million, two hundred thirty-seven thousand, five hundred twenty-one".