402520051 has 4 divisors (see below), whose sum is σ = 403142832. Its totient is φ = 401897272.

The previous prime is 402520043. The next prime is 402520081. The reversal of 402520051 is 150025204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402520051 - 2³ = 402520043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402520031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310420 + ... + 311713.

It is an arithmetic number, because the mean of its divisors is an integer number (100785708).

Almost surely, 2^402520051 is an apocalyptic number.

402520051 is a deficient number, since it is larger than the sum of its proper divisors (622781).

402520051 is an equidigital number, since it uses as much as digits as its factorization.

402520051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622780.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 402520051 is about 20062.9023573360. The cubic root of 402520051 is about 738.3503861502.

Adding to 402520051 its reverse (150025204), we get a palindrome (552545255).

The spelling of 402520051 in words is "four hundred two million, five hundred twenty thousand, fifty-one".