72101401 has 2 divisors, whose sum is σ = 72101402. Its totient is φ = 72101400.

The previous prime is 72101387. The next prime is 72101459. The reversal of 72101401 is 10410127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 15023376 = 7555^2 + 3876^2 .

It is a cyclic number.

It is not a de Polignac number, because 72101401 - 2¹¹ = 72099353 is a prime.

It is a super-2 number, since 2×72101401² = 10397224052325602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72101461) 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, 36050700 + 36050701.

It is an arithmetic number, because the mean of its divisors is an integer number (36050701).

Almost surely, 2^72101401 is an apocalyptic number.

It is an amenable number.

72101401 is a deficient number, since it is larger than the sum of its proper divisors (1).

72101401 is an equidigital number, since it uses as much as digits as its factorization.

72101401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 72101401 is about 8491.2543831874. The cubic root of 72101401 is about 416.2119716842.

Adding to 72101401 its reverse (10410127), we get a palindrome (82511528).

The spelling of 72101401 in words is "seventy-two million, one hundred one thousand, four hundred one".