72401431 has 2 divisors, whose sum is σ = 72401432. Its totient is φ = 72401430.

The previous prime is 72401389. The next prime is 72401471. The reversal of 72401431 is 13410427.

It is a strong prime.

It is an emirp because it is prime and its reverse (13410427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72401431 - 2⁹ = 72400919 is a prime.

It is a super-2 number, since 2×72401431² = 10483934421695522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72401471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200715 + 36200716.

It is an arithmetic number, because the mean of its divisors is an integer number (36200716).

Almost surely, 2^72401431 is an apocalyptic number.

72401431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72401431 is an equidigital number, since it uses as much as digits as its factorization.

72401431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 72401431 is about 8508.9030432835. The cubic root of 72401431 is about 416.7884896763.

Adding to 72401431 its reverse (13410427), we get a palindrome (85811858).

The spelling of 72401431 in words is "seventy-two million, four hundred one thousand, four hundred thirty-one".