72143431 has 2 divisors, whose sum is σ = 72143432. Its totient is φ = 72143430.

The previous prime is 72143413. The next prime is 72143447. The reversal of 72143431 is 13434127.

Together with previous prime (72143413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72143431 - 2⁹ = 72142919 is a prime.

It is a super-2 number, since 2×72143431² = 10409349272903522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72143396 and 72143405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72143411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36071715 + 36071716.

It is an arithmetic number, because the mean of its divisors is an integer number (36071716).

Almost surely, 2^72143431 is an apocalyptic number.

72143431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72143431 is an equidigital number, since it uses as much as digits as its factorization.

72143431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 72143431 is about 8493.7289219753. The cubic root of 72143431 is about 416.2928299888.

Adding to 72143431 its reverse (13434127), we get a palindrome (85577558).

The spelling of 72143431 in words is "seventy-two million, one hundred forty-three thousand, four hundred thirty-one".