31209693461 has 2 divisors, whose sum is σ = 31209693462. Its totient is φ = 31209693460.

The previous prime is 31209693451. The next prime is 31209693527. The reversal of 31209693461 is 16439690213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29620475236 + 1589218225 = 172106^2 + 39865^2 .

It is an emirp because it is prime and its reverse (16439690213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31209693461 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31209693451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15604846730 + 15604846731.

It is an arithmetic number, because the mean of its divisors is an integer number (15604846731).

Almost surely, 2^31209693461 is an apocalyptic number.

It is an amenable number.

31209693461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31209693461 is an equidigital number, since it uses as much as digits as its factorization.

31209693461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 31209693461 in words is "thirty-one billion, two hundred nine million, six hundred ninety-three thousand, four hundred sixty-one".