402551 has 2 divisors, whose sum is σ = 402552. Its totient is φ = 402550.

The previous prime is 402541. The next prime is 402559. The reversal of 402551 is 155204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402551 - 2⁶ = 402487 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201275 + 201276.

It is an arithmetic number, because the mean of its divisors is an integer number (201276).

2⁴⁰²⁵⁵¹ is an apocalyptic number.

402551 is a deficient number, since it is larger than the sum of its proper divisors (1).

402551 is an equidigital number, since it uses as much as digits as its factorization.

402551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 402551 is about 634.4690693801. The cubic root of 402551 is about 73.8369309117.

Adding to 402551 its reverse (155204), we get a palindrome (557755).

The spelling of 402551 in words is "four hundred two thousand, five hundred fifty-one".