73433431 has 2 divisors, whose sum is σ = 73433432. Its totient is φ = 73433430.

The previous prime is 73433429. The next prime is 73433509. The reversal of 73433431 is 13433437.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 73433431 - 2¹ = 73433429 is a prime.

It is a super-2 number, since 2×73433431² = 10784937576863522, which contains 22 as substring.

Together with 73433429, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 73433431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73433831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36716715 + 36716716.

It is an arithmetic number, because the mean of its divisors is an integer number (36716716).

Almost surely, 2^73433431 is an apocalyptic number.

73433431 is the 4581-st centered heptagonal number.

73433431 is a deficient number, since it is larger than the sum of its proper divisors (1).

73433431 is an equidigital number, since it uses as much as digits as its factorization.

73433431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 28.

The square root of 73433431 is about 8569.3308373525. The cubic root of 73433431 is about 418.7594364548.

Adding to 73433431 its reverse (13433437), we get a palindrome (86866868).

The spelling of 73433431 in words is "seventy-three million, four hundred thirty-three thousand, four hundred thirty-one".