402215501 has 2 divisors, whose sum is σ = 402215502. Its totient is φ = 402215500.

The previous prime is 402215479. The next prime is 402215509. The reversal of 402215501 is 105512204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205234276 + 196981225 = 14326^2 + 14035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402215501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402215509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201107750 + 201107751.

It is an arithmetic number, because the mean of its divisors is an integer number (201107751).

Almost surely, 2^402215501 is an apocalyptic number.

It is an amenable number.

402215501 is a deficient number, since it is larger than the sum of its proper divisors (1).

402215501 is an equidigital number, since it uses as much as digits as its factorization.

402215501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 402215501 is about 20055.3110422152. The cubic root of 402215501 is about 738.1641251637.

Adding to 402215501 its reverse (105512204), we get a palindrome (507727705).

The spelling of 402215501 in words is "four hundred two million, two hundred fifteen thousand, five hundred one".