401199561 has 48 divisors (see below), whose sum is σ = 691518464. Its totient is φ = 227692944.

The previous prime is 401199553. The next prime is 401199563. The reversal of 401199561 is 165991104.

401199561 is a `hidden beast` number, since 4 + 0 + 1 + 1 + 99 + 561 = 666.

It is not a de Polignac number, because 401199561 - 2³ = 401199553 is a prime.

It is a super-2 number, since 2×401199561² = 321922175493185442, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401199563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 276540 + ... + 277986.

Almost surely, 2^401199561 is an apocalyptic number.

It is an amenable number.

401199561 is a deficient number, since it is larger than the sum of its proper divisors (290318903).

401199561 is a wasteful number, since it uses less digits than its factorization.

401199561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 401199561 is about 20029.9665751094. The cubic root of 401199561 is about 737.5421014364.

The spelling of 401199561 in words is "four hundred one million, one hundred ninety-nine thousand, five hundred sixty-one".