1531222146 has 12 divisors (see below), whose sum is σ = 3317648022. Its totient is φ = 510407376.

The previous prime is 1531222073. The next prime is 1531222211. The reversal of 1531222146 is 6412221351.

It can be written as a sum of positive squares in only one way, i.e., 1172309121 + 358913025 = 34239^2 + 18945^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42533931 + ... + 42533966.

Almost surely, 2^1531222146 is an apocalyptic number.

1531222146 is an abundant number, since it is smaller than the sum of its proper divisors (1786425876).

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

1531222146 is a wasteful number, since it uses less digits than its factorization.

1531222146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85067905 (or 85067902 counting only the distinct ones).

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

The square root of 1531222146 is about 39130.8336992710. The cubic root of 1531222146 is about 1152.6020841781.

Adding to 1531222146 its reverse (6412221351), we get a palindrome (7943443497).

The spelling of 1531222146 in words is "one billion, five hundred thirty-one million, two hundred twenty-two thousand, one hundred forty-six".