401106509 has 4 divisors (see below), whose sum is σ = 401166204. Its totient is φ = 401046816.

The previous prime is 401106493. The next prime is 401106521. The reversal of 401106509 is 905601104.

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 255904009 + 145202500 = 15997^2 + 12050^2 .

It is a cyclic number.

It is not a de Polignac number, because 401106509 - 2⁴ = 401106493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401106539) 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, 18272 + ... + 33705.

It is an arithmetic number, because the mean of its divisors is an integer number (100291551).

Almost surely, 2^401106509 is an apocalyptic number.

It is an amenable number.

401106509 is a deficient number, since it is larger than the sum of its proper divisors (59695).

401106509 is an equidigital number, since it uses as much as digits as its factorization.

401106509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59694.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 401106509 is about 20027.6436207558. The cubic root of 401106509 is about 737.4850765533.

The spelling of 401106509 in words is "four hundred one million, one hundred six thousand, five hundred nine".