401320501 has 2 divisors, whose sum is σ = 401320502. Its totient is φ = 401320500.

The previous prime is 401320499. The next prime is 401320519. The reversal of 401320501 is 105023104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270767025 + 130553476 = 16455^2 + 11426^2 .

It is a cyclic number.

It is not a de Polignac number, because 401320501 - 2¹ = 401320499 is a prime.

It is a super-2 number, since 2×401320501² = 322116289045782002, which contains 22 as substring.

Together with 401320499, 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 (401320561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200660250 + 200660251.

It is an arithmetic number, because the mean of its divisors is an integer number (200660251).

Almost surely, 2^401320501 is an apocalyptic number.

It is an amenable number.

401320501 is a deficient number, since it is larger than the sum of its proper divisors (1).

401320501 is an equidigital number, since it uses as much as digits as its factorization.

401320501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 401320501 is about 20032.9853242097. The cubic root of 401320501 is about 737.6162036947.

Adding to 401320501 its reverse (105023104), we get a palindrome (506343605).

The spelling of 401320501 in words is "four hundred one million, three hundred twenty thousand, five hundred one".