1031213609 has 2 divisors, whose sum is σ = 1031213610. Its totient is φ = 1031213608.

The previous prime is 1031213587. The next prime is 1031213611. The reversal of 1031213609 is 9063121301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 959760400 + 71453209 = 30980^2 + 8453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031213609 is a prime.

Together with 1031213611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1031213629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515606804 + 515606805.

It is an arithmetic number, because the mean of its divisors is an integer number (515606805).

Almost surely, 2^1031213609 is an apocalyptic number.

It is an amenable number.

1031213609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031213609 is an equidigital number, since it uses as much as digits as its factorization.

1031213609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1031213609 is about 32112.5148345626. The cubic root of 1031213609 is about 1010.2981209943.

The spelling of 1031213609 in words is "one billion, thirty-one million, two hundred thirteen thousand, six hundred nine".