1531402146 has 64 divisors (see below), whose sum is σ = 3585853440. Its totient is φ = 483492240.

The previous prime is 1531402141. The next prime is 1531402153. The reversal of 1531402146 is 6412041351.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1531402141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121941 + ... + 133911.

It is an arithmetic number, because the mean of its divisors is an integer number (56028960).

Almost surely, 2^1531402146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1531402146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792926720).

1531402146 is an abundant number, since it is smaller than the sum of its proper divisors (2054451294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531402146 is a wasteful number, since it uses less digits than its factorization.

1531402146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12108 (or 12102 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1531402146 is about 39133.1336082354. The cubic root of 1531402146 is about 1152.6472464137.

Adding to 1531402146 its reverse (6412041351), we get a palindrome (7943443497).

The spelling of 1531402146 in words is "one billion, five hundred thirty-one million, four hundred two thousand, one hundred forty-six".