401112781 has 4 divisors (see below), whose sum is σ = 422224000. Its totient is φ = 380001564.

The previous prime is 401112779. The next prime is 401112787. The reversal of 401112781 is 187211104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401112781 - 2¹ = 401112779 is a prime.

It is a super-2 number, since 2×401112781² = 321782926163107922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401112787) 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 3 ways as a sum of consecutive naturals, for example, 10555581 + ... + 10555618.

It is an arithmetic number, because the mean of its divisors is an integer number (105556000).

Almost surely, 2^401112781 is an apocalyptic number.

It is an amenable number.

401112781 is a deficient number, since it is larger than the sum of its proper divisors (21111219).

401112781 is a wasteful number, since it uses less digits than its factorization.

401112781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21111218.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 401112781 is about 20027.8002037168. The cubic root of 401112781 is about 737.4889204885.

Adding to 401112781 its reverse (187211104), we get a palindrome (588323885).

The spelling of 401112781 in words is "four hundred one million, one hundred twelve thousand, seven hundred eighty-one".