2151631402 has 8 divisors (see below), whose sum is σ = 3397312800. Its totient is φ = 1019193804.

The previous prime is 2151631397. The next prime is 2151631403. The reversal of 2151631402 is 2041361512.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (2151631403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28310902 + ... + 28310977.

It is an arithmetic number, because the mean of its divisors is an integer number (424664100).

Almost surely, 2^2151631402 is an apocalyptic number.

2151631402 is a deficient number, since it is larger than the sum of its proper divisors (1245681398).

2151631402 is a wasteful number, since it uses less digits than its factorization.

2151631402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56621900.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2151631402 is about 46385.6810017919. The cubic root of 2151631402 is about 1290.9892462029.

Adding to 2151631402 its reverse (2041361512), we get a palindrome (4192992914).

The spelling of 2151631402 in words is "two billion, one hundred fifty-one million, six hundred thirty-one thousand, four hundred two".