73320431 has 2 divisors, whose sum is σ = 73320432. Its totient is φ = 73320430.

The previous prime is 73320419. The next prime is 73320433. The reversal of 73320431 is 13402337.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73320431 is a prime.

It is a super-2 number, since 2×73320431² = 10751771204051522, which contains 22 as substring.

Together with 73320433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 73320397 and 73320406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73320433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36660215 + 36660216.

It is an arithmetic number, because the mean of its divisors is an integer number (36660216).

Almost surely, 2^73320431 is an apocalyptic number.

73320431 is a deficient number, since it is larger than the sum of its proper divisors (1).

73320431 is an equidigital number, since it uses as much as digits as its factorization.

73320431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 73320431 is about 8562.7350186725. The cubic root of 73320431 is about 418.5445293001.

Adding to 73320431 its reverse (13402337), we get a palindrome (86722768).

The spelling of 73320431 in words is "seventy-three million, three hundred twenty thousand, four hundred thirty-one".