401821613 has 4 divisors (see below), whose sum is σ = 403014300. Its totient is φ = 400628928.

The previous prime is 401821603. The next prime is 401821621. The reversal of 401821613 is 316128104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 162129289 + 239692324 = 12733^2 + 15482^2 .

It is a cyclic number.

It is not a de Polignac number, because 401821613 - 2¹² = 401817517 is a prime.

It is a super-2 number, since 2×401821613² = 322921217347843538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401821603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595838 + ... + 596511.

It is an arithmetic number, because the mean of its divisors is an integer number (100753575).

Almost surely, 2^401821613 is an apocalyptic number.

It is an amenable number.

401821613 is a deficient number, since it is larger than the sum of its proper divisors (1192687).

401821613 is a wasteful number, since it uses less digits than its factorization.

401821613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192686.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 401821613 is about 20045.4885946938. The cubic root of 401821613 is about 737.9230860911.

Adding to 401821613 its reverse (316128104), we get a palindrome (717949717).

The spelling of 401821613 in words is "four hundred one million, eight hundred twenty-one thousand, six hundred thirteen".