402610121 has 2 divisors, whose sum is σ = 402610122. Its totient is φ = 402610120.

The previous prime is 402610097. The next prime is 402610157. The reversal of 402610121 is 121016204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321700096 + 80910025 = 17936^2 + 8995^2 .

It is a cyclic number.

It is not a de Polignac number, because 402610121 - 2²² = 398415817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 402610121.

It is not a weakly prime, because it can be changed into another prime (402610921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201305060 + 201305061.

It is an arithmetic number, because the mean of its divisors is an integer number (201305061).

Almost surely, 2^402610121 is an apocalyptic number.

It is an amenable number.

402610121 is a deficient number, since it is larger than the sum of its proper divisors (1).

402610121 is an equidigital number, since it uses as much as digits as its factorization.

402610121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 402610121 is about 20065.1469219640. The cubic root of 402610121 is about 738.4054544293.

Adding to 402610121 its reverse (121016204), we get a palindrome (523626325).

The spelling of 402610121 in words is "four hundred two million, six hundred ten thousand, one hundred twenty-one".