31142331449 has 2 divisors, whose sum is σ = 31142331450. Its totient is φ = 31142331448.

The previous prime is 31142331379. The next prime is 31142331457. The reversal of 31142331449 is 94413324113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21420371449 + 9721960000 = 146357^2 + 98600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31142331449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31142331469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571165724 + 15571165725.

It is an arithmetic number, because the mean of its divisors is an integer number (15571165725).

Almost surely, 2^31142331449 is an apocalyptic number.

It is an amenable number.

31142331449 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142331449 is an equidigital number, since it uses as much as digits as its factorization.

31142331449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The spelling of 31142331449 in words is "thirty-one billion, one hundred forty-two million, three hundred thirty-one thousand, four hundred forty-nine".