401326051009 has 9 divisors (see below), whose sum is σ = 434580914019. Its totient is φ = 370447214280.

The previous prime is 401326050991. The next prime is 401326051031. The reversal of 401326051009 is 900150623104.

The square root of 401326051009 is 633503.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 59367759025 + 341958291984 = 243655^2 + 584772^2 .

It is not a de Polignac number, because 401326051009 - 2²³ = 401317662401 is a prime.

It is a super-2 number, since 2×401326051009² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401326051069) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8211174 + ... + 8259904.

Almost surely, 2^401326051009 is an apocalyptic number.

401326051009 is the 633503-rd square number.

401326051009 is the 316752-nd centered octagonal number.

It is an amenable number.

401326051009 is a deficient number, since it is larger than the sum of its proper divisors (33254863010).

401326051009 is an frugal number, since it uses more digits than its factorization.

401326051009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97488 (or 48744 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 401326051009 in words is "four hundred one billion, three hundred twenty-six million, fifty-one thousand, nine".