401661545 has 4 divisors (see below), whose sum is σ = 481993860. Its totient is φ = 321329232.

The previous prime is 401661541. The next prime is 401661587. The reversal of 401661545 is 545166104.

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 174345616 + 227315929 = 13204^2 + 15077^2 .

It is a cyclic number.

It is not a de Polignac number, because 401661545 - 2² = 401661541 is a prime.

It is a super-2 number, since 2×401661545² = 322663993463574050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401661541) 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, 40166150 + ... + 40166159.

It is an arithmetic number, because the mean of its divisors is an integer number (120498465).

Almost surely, 2^401661545 is an apocalyptic number.

It is an amenable number.

401661545 is a deficient number, since it is larger than the sum of its proper divisors (80332315).

401661545 is an equidigital number, since it uses as much as digits as its factorization.

401661545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80332314.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 401661545 is about 20041.4955779253. The cubic root of 401661545 is about 737.8250877451.

The spelling of 401661545 in words is "four hundred one million, six hundred sixty-one thousand, five hundred forty-five".