72300001531 has 2 divisors, whose sum is σ = 72300001532. Its totient is φ = 72300001530.

The previous prime is 72300001493. The next prime is 72300001591. The reversal of 72300001531 is 13510000327.

It is a weak prime.

It is an emirp because it is prime and its reverse (13510000327) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72300001531 - 2²¹ = 72297904379 is a prime.

It is a super-2 number, since 2×72300001531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72300001591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36150000765 + 36150000766.

It is an arithmetic number, because the mean of its divisors is an integer number (36150000766).

Almost surely, 2^72300001531 is an apocalyptic number.

72300001531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72300001531 is an equidigital number, since it uses as much as digits as its factorization.

72300001531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

Adding to 72300001531 its reverse (13510000327), we get a palindrome (85810001858).

The spelling of 72300001531 in words is "seventy-two billion, three hundred million, one thousand, five hundred thirty-one".