402143551 has 16 divisors (see below), whose sum is σ = 442454400. Its totient is φ = 363801088.

The previous prime is 402143527. The next prime is 402143593. The reversal of 402143551 is 155341204.

It is a happy number.

It is not a de Polignac number, because 402143551 - 2⁹ = 402143039 is a prime.

It is a super-2 number, since 2×402143551² = 323438871221779202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402143851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116121 + ... + 119533.

It is an arithmetic number, because the mean of its divisors is an integer number (27653400).

Almost surely, 2^402143551 is an apocalyptic number.

402143551 is a deficient number, since it is larger than the sum of its proper divisors (40310849).

402143551 is a wasteful number, since it uses less digits than its factorization.

402143551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 402143551 is about 20053.5171728054. The cubic root of 402143551 is about 738.1201072380.

Adding to 402143551 its reverse (155341204), we get a palindrome (557484755).

The spelling of 402143551 in words is "four hundred two million, one hundred forty-three thousand, five hundred fifty-one".