201624391 has 2 divisors, whose sum is σ = 201624392. Its totient is φ = 201624390.

The previous prime is 201624389. The next prime is 201624413. The reversal of 201624391 is 193426102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201624391 - 2¹ = 201624389 is a prime.

It is a super-2 number, since 2×201624391² = 81304790092241762, which contains 22 as substring.

Together with 201624389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201624191) 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, 100812195 + 100812196.

It is an arithmetic number, because the mean of its divisors is an integer number (100812196).

Almost surely, 2^201624391 is an apocalyptic number.

201624391 is a deficient number, since it is larger than the sum of its proper divisors (1).

201624391 is an equidigital number, since it uses as much as digits as its factorization.

201624391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 201624391 is about 14199.4503766871. The cubic root of 201624391 is about 586.3825298853.

The spelling of 201624391 in words is "two hundred one million, six hundred twenty-four thousand, three hundred ninety-one".