402115251 has 8 divisors (see below), whose sum is σ = 537984720. Its totient is φ = 267161312.

The previous prime is 402115237. The next prime is 402115253. The reversal of 402115251 is 152511204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402115251 - 2¹⁸ = 401853107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402115253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227856 + ... + 229613.

It is an arithmetic number, because the mean of its divisors is an integer number (67248090).

Almost surely, 2^402115251 is an apocalyptic number.

402115251 is a deficient number, since it is larger than the sum of its proper divisors (135869469).

402115251 is a wasteful number, since it uses less digits than its factorization.

402115251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457765.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 402115251 is about 20052.8115485086. The cubic root of 402115251 is about 738.1027922859.

Adding to 402115251 its reverse (152511204), we get a palindrome (554626455).

The spelling of 402115251 in words is "four hundred two million, one hundred fifteen thousand, two hundred fifty-one".