401256811 has 4 divisors (see below), whose sum is σ = 403357824. Its totient is φ = 399155800.

The previous prime is 401256803. The next prime is 401256829. The reversal of 401256811 is 118652104.

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 401256811 - 2³ = 401256803 is a prime.

It is a super-2 number, since 2×401256811² = 322014056747779442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401256811.

It is not an unprimeable number, because it can be changed into a prime (401256871) 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, 1050220 + ... + 1050601.

It is an arithmetic number, because the mean of its divisors is an integer number (100839456).

Almost surely, 2^401256811 is an apocalyptic number.

401256811 is a deficient number, since it is larger than the sum of its proper divisors (2101013).

401256811 is a wasteful number, since it uses less digits than its factorization.

401256811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101012.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 401256811 is about 20031.3956328559. The cubic root of 401256811 is about 737.5771814657.

The spelling of 401256811 in words is "four hundred one million, two hundred fifty-six thousand, eight hundred eleven".