401775971 has 4 divisors (see below), whose sum is σ = 402594744. Its totient is φ = 400957200.

The previous prime is 401775931. The next prime is 401775973. The reversal of 401775971 is 179577104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401775971 - 2²⁶ = 334667107 is a prime.

It is a super-2 number, since 2×401775971² = 322847861745985682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401775973) 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, 408650 + ... + 409631.

It is an arithmetic number, because the mean of its divisors is an integer number (100648686).

Almost surely, 2^401775971 is an apocalyptic number.

401775971 is a deficient number, since it is larger than the sum of its proper divisors (818773).

401775971 is an equidigital number, since it uses as much as digits as its factorization.

401775971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818772.

The product of its (nonzero) digits is 61740, while the sum is 41.

The square root of 401775971 is about 20044.3501017120. The cubic root of 401775971 is about 737.8951453667.

The spelling of 401775971 in words is "four hundred one million, seven hundred seventy-five thousand, nine hundred seventy-one".