401661547 has 16 divisors (see below), whose sum is σ = 465120000. Its totient is φ = 339746400.

The previous prime is 401661541. The next prime is 401661587. The reversal of 401661547 is 745166104.

It is not a de Polignac number, because 401661547 - 2⁷ = 401661419 is a prime.

It is a super-2 number, since 2×401661547² = 322663996676866418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401661541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267204 + ... + 268702.

It is an arithmetic number, because the mean of its divisors is an integer number (29070000).

Almost surely, 2^401661547 is an apocalyptic number.

401661547 is a deficient number, since it is larger than the sum of its proper divisors (63458453).

401661547 is a wasteful number, since it uses less digits than its factorization.

401661547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 401661547 is about 20041.4956278218. The cubic root of 401661547 is about 737.8250889698.

The spelling of 401661547 in words is "four hundred one million, six hundred sixty-one thousand, five hundred forty-seven".