72354551 has 2 divisors, whose sum is σ = 72354552. Its totient is φ = 72354550.

The previous prime is 72354547. The next prime is 72354553. The reversal of 72354551 is 15545327.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72354551 - 2² = 72354547 is a prime.

Together with 72354553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72354553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36177275 + 36177276.

It is an arithmetic number, because the mean of its divisors is an integer number (36177276).

Almost surely, 2^72354551 is an apocalyptic number.

72354551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72354551 is an equidigital number, since it uses as much as digits as its factorization.

72354551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 32.

The square root of 72354551 is about 8506.1478355364. The cubic root of 72354551 is about 416.6985132636.

Adding to 72354551 its reverse (15545327), we get a palindrome (87899878).

The spelling of 72354551 in words is "seventy-two million, three hundred fifty-four thousand, five hundred fifty-one".