402111291 has 8 divisors (see below), whose sum is σ = 540893520. Its totient is φ = 265701632.

The previous prime is 402111289. The next prime is 402111299. The reversal of 402111291 is 192111204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402111291 - 2¹ = 402111289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402111299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592746 + ... + 593423.

It is an arithmetic number, because the mean of its divisors is an integer number (67611690).

Almost surely, 2^402111291 is an apocalyptic number.

402111291 is a deficient number, since it is larger than the sum of its proper divisors (138782229).

402111291 is a wasteful number, since it uses less digits than its factorization.

402111291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186285.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 402111291 is about 20052.7128089942. The cubic root of 402111291 is about 738.1003693514.

Adding to 402111291 its reverse (192111204), we get a palindrome (594222495).

The spelling of 402111291 in words is "four hundred two million, one hundred eleven thousand, two hundred ninety-one".