72109451 has 2 divisors, whose sum is σ = 72109452. Its totient is φ = 72109450.

The previous prime is 72109397. The next prime is 72109459. The reversal of 72109451 is 15490127.

It is a strong prime.

It is an emirp because it is prime and its reverse (15490127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72109451 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72109459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36054725 + 36054726.

It is an arithmetic number, because the mean of its divisors is an integer number (36054726).

Almost surely, 2^72109451 is an apocalyptic number.

72109451 is a deficient number, since it is larger than the sum of its proper divisors (1).

72109451 is an equidigital number, since it uses as much as digits as its factorization.

72109451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 72109451 is about 8491.7283870835. The cubic root of 72109451 is about 416.2274608963.

Adding to 72109451 its reverse (15490127), we get a palindrome (87599578).

It can be divided in two parts, 7210 and 9451, that added together give a palindrome (16661).

The spelling of 72109451 in words is "seventy-two million, one hundred nine thousand, four hundred fifty-one".