401355371609 has 2 divisors, whose sum is σ = 401355371610. Its totient is φ = 401355371608.

The previous prime is 401355371587. The next prime is 401355371639. The reversal of 401355371609 is 906173553104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289228840000 + 112126531609 = 537800^2 + 334853^2 .

It is a cyclic number.

It is not a de Polignac number, because 401355371609 - 2¹⁶ = 401355306073 is a prime.

It is a super-2 number, since 2×401355371609² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401355371609.

It is not a weakly prime, because it can be changed into another prime (401355371639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200677685804 + 200677685805.

It is an arithmetic number, because the mean of its divisors is an integer number (200677685805).

Almost surely, 2^401355371609 is an apocalyptic number.

It is an amenable number.

401355371609 is a deficient number, since it is larger than the sum of its proper divisors (1).

401355371609 is an equidigital number, since it uses as much as digits as its factorization.

401355371609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 44.

The spelling of 401355371609 in words is "four hundred one billion, three hundred fifty-five million, three hundred seventy-one thousand, six hundred nine".