72251401 has 2 divisors, whose sum is σ = 72251402. Its totient is φ = 72251400.

The previous prime is 72251371. The next prime is 72251419. The reversal of 72251401 is 10415227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 30261001 = 6480^2 + 5501^2 .

It is an emirp because it is prime and its reverse (10415227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72251401 - 2⁷ = 72251273 is a prime.

It is not a weakly prime, because it can be changed into another prime (72251701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36125700 + 36125701.

It is an arithmetic number, because the mean of its divisors is an integer number (36125701).

Almost surely, 2^72251401 is an apocalyptic number.

It is an amenable number.

72251401 is a deficient number, since it is larger than the sum of its proper divisors (1).

72251401 is an equidigital number, since it uses as much as digits as its factorization.

72251401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 72251401 is about 8500.0824113652. The cubic root of 72251401 is about 416.5004013606.

Adding to 72251401 its reverse (10415227), we get a palindrome (82666628).

The spelling of 72251401 in words is "seventy-two million, two hundred fifty-one thousand, four hundred one".