402001111 has 2 divisors, whose sum is σ = 402001112. Its totient is φ = 402001110.

The previous prime is 402001099. The next prime is 402001133. The reversal of 402001111 is 111100204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402001111 - 2⁵ = 402001079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402001511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201000555 + 201000556.

It is an arithmetic number, because the mean of its divisors is an integer number (201000556).

Almost surely, 2^402001111 is an apocalyptic number.

402001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

402001111 is an equidigital number, since it uses as much as digits as its factorization.

402001111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 402001111 is about 20049.9653615661. The cubic root of 402001111 is about 738.0329491046.

Adding to 402001111 its reverse (111100204), we get a palindrome (513101315).

The spelling of 402001111 in words is "four hundred two million, one thousand, one hundred eleven".