72407551 has 2 divisors, whose sum is σ = 72407552. Its totient is φ = 72407550.

The previous prime is 72407521. The next prime is 72407561. The reversal of 72407551 is 15570427.

It is a strong prime.

It is an emirp because it is prime and its reverse (15570427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72407551 - 2¹¹ = 72405503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72407521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36203775 + 36203776.

It is an arithmetic number, because the mean of its divisors is an integer number (36203776).

Almost surely, 2^72407551 is an apocalyptic number.

72407551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72407551 is an equidigital number, since it uses as much as digits as its factorization.

72407551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 72407551 is about 8509.2626590087. The cubic root of 72407551 is about 416.8002328774.

Adding to 72407551 its reverse (15570427), we get a palindrome (87977978).

The spelling of 72407551 in words is "seventy-two million, four hundred seven thousand, five hundred fifty-one".