401751561 has 16 divisors (see below), whose sum is σ = 567929600. Its totient is φ = 251907408.

The previous prime is 401751533. The next prime is 401751563. The reversal of 401751561 is 165157104.

It is not a de Polignac number, because 401751561 - 2¹⁷ = 401620489 is a prime.

It is a super-3 number, since 3×401751561³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401751563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17431 + ... + 33276.

It is an arithmetic number, because the mean of its divisors is an integer number (35495600).

Almost surely, 2^401751561 is an apocalyptic number.

It is an amenable number.

401751561 is a deficient number, since it is larger than the sum of its proper divisors (166178039).

401751561 is a wasteful number, since it uses less digits than its factorization.

401751561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50868.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 401751561 is about 20043.7411927015. The cubic root of 401751561 is about 737.8802013958.

The spelling of 401751561 in words is "four hundred one million, seven hundred fifty-one thousand, five hundred sixty-one".