402201491 has 2 divisors, whose sum is σ = 402201492. Its totient is φ = 402201490.

The previous prime is 402201467. The next prime is 402201559. The reversal of 402201491 is 194102204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402201491 - 2⁶ = 402201427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (402201461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201100745 + 201100746.

It is an arithmetic number, because the mean of its divisors is an integer number (201100746).

Almost surely, 2^402201491 is an apocalyptic number.

402201491 is a deficient number, since it is larger than the sum of its proper divisors (1).

402201491 is an equidigital number, since it uses as much as digits as its factorization.

402201491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 402201491 is about 20054.9617551368. The cubic root of 402201491 is about 738.1555544684.

Adding to 402201491 its reverse (194102204), we get a palindrome (596303695).

The spelling of 402201491 in words is "four hundred two million, two hundred one thousand, four hundred ninety-one".