72050551 has 2 divisors, whose sum is σ = 72050552. Its totient is φ = 72050550.

The previous prime is 72050509. The next prime is 72050569. The reversal of 72050551 is 15505027.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (15505027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72050551 - 2⁷ = 72050423 is a prime.

It is equal to p_4231474 and since 72050551 and 4231474 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72050591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36025275 + 36025276.

It is an arithmetic number, because the mean of its divisors is an integer number (36025276).

Almost surely, 2^72050551 is an apocalyptic number.

72050551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72050551 is an equidigital number, since it uses as much as digits as its factorization.

72050551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 72050551 is about 8488.2595978210. The cubic root of 72050551 is about 416.1141032385.

Adding to 72050551 its reverse (15505027), we get a palindrome (87555578).

The spelling of 72050551 in words is "seventy-two million, fifty thousand, five hundred fifty-one".