402132491 has 2 divisors, whose sum is σ = 402132492. Its totient is φ = 402132490.

The previous prime is 402132463. The next prime is 402132499. The reversal of 402132491 is 194231204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402132491 - 2²² = 397938187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402132491.

It is not a weakly prime, because it can be changed into another prime (402132499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201066245 + 201066246.

It is an arithmetic number, because the mean of its divisors is an integer number (201066246).

Almost surely, 2^402132491 is an apocalyptic number.

402132491 is a deficient number, since it is larger than the sum of its proper divisors (1).

402132491 is an equidigital number, since it uses as much as digits as its factorization.

402132491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 402132491 is about 20053.2414088097. The cubic root of 402132491 is about 738.1133404312.

Adding to 402132491 its reverse (194231204), we get a palindrome (596363695).

The spelling of 402132491 in words is "four hundred two million, one hundred thirty-two thousand, four hundred ninety-one".