1312531002 has 24 divisors (see below), whose sum is σ = 3011101236. Its totient is φ = 411774336.

The previous prime is 1312530997. The next prime is 1312531009. The reversal of 1312531002 is 2001352131.

1312531002 is a `hidden beast` number, since 131 + 2 + 531 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1280279961 + 32251041 = 35781^2 + 5679^2 .

It is a super-2 number, since 2×1312531002² = 3445475262422248008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1312531009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2144353 + ... + 2144964.

Almost surely, 2^1312531002 is an apocalyptic number.

1312531002 is an abundant number, since it is smaller than the sum of its proper divisors (1698570234).

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

1312531002 is a wasteful number, since it uses less digits than its factorization.

1312531002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289342 (or 4289339 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1312531002 is about 36228.8697311964. The cubic root of 1312531002 is about 1094.8884054662. Note that the first 3 decimals are identical.

Adding to 1312531002 its reverse (2001352131), we get a palindrome (3313883133).

The spelling of 1312531002 in words is "one billion, three hundred twelve million, five hundred thirty-one thousand, two".