401305597621 has 8 divisors (see below), whose sum is σ = 412164568760. Its totient is φ = 390447304128.

The previous prime is 401305597607. The next prime is 401305597657. The reversal of 401305597621 is 126795503104.

It can be written as a sum of positive squares in 4 ways, for example, as 8409807025 + 392895790596 = 91705^2 + 626814^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401305597621 - 2¹³ = 401305589429 is a prime.

It is a super-2 number, since 2×401305597621² (a number of 24 digits) 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 (401305597661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1172995 + ... + 1475983.

It is an arithmetic number, because the mean of its divisors is an integer number (51520571095).

Almost surely, 2^401305597621 is an apocalyptic number.

It is an amenable number.

401305597621 is a deficient number, since it is larger than the sum of its proper divisors (10858971139).

401305597621 is a wasteful number, since it uses less digits than its factorization.

401305597621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338823.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 401305597621 in words is "four hundred one billion, three hundred five million, five hundred ninety-seven thousand, six hundred twenty-one".