401471561 has 4 divisors (see below), whose sum is σ = 408053124. Its totient is φ = 394890000.

The previous prime is 401471533. The next prime is 401471569. The reversal of 401471561 is 165174104.

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 191656336 + 209815225 = 13844^2 + 14485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401471561 is a prime.

It is a super-2 number, since 2×401471561² = 322358828583553442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401471569) 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, 3290690 + ... + 3290811.

It is an arithmetic number, because the mean of its divisors is an integer number (102013281).

Almost surely, 2^401471561 is an apocalyptic number.

It is an amenable number.

401471561 is a deficient number, since it is larger than the sum of its proper divisors (6581563).

401471561 is an equidigital number, since it uses as much as digits as its factorization.

401471561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581562.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 401471561 is about 20036.7552512876. The cubic root of 401471561 is about 737.7087401471.

The spelling of 401471561 in words is "four hundred one million, four hundred seventy-one thousand, five hundred sixty-one".