31425319997 has 2 divisors, whose sum is σ = 31425319998. Its totient is φ = 31425319996.

The previous prime is 31425319993. The next prime is 31425320033. The reversal of 31425319997 is 79991352413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24867397636 + 6557922361 = 157694^2 + 80981^2 .

It is a cyclic number.

It is not a de Polignac number, because 31425319997 - 2² = 31425319993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31425319993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15712659998 + 15712659999.

It is an arithmetic number, because the mean of its divisors is an integer number (15712659999).

Almost surely, 2^31425319997 is an apocalyptic number.

It is an amenable number.

31425319997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31425319997 is an equidigital number, since it uses as much as digits as its factorization.

31425319997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 53.

The spelling of 31425319997 in words is "thirty-one billion, four hundred twenty-five million, three hundred nineteen thousand, nine hundred ninety-seven".