31125343409 has 2 divisors, whose sum is σ = 31125343410. Its totient is φ = 31125343408.

The previous prime is 31125343393. The next prime is 31125343433. The reversal of 31125343409 is 90434352113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22334405809 + 8790937600 = 149447^2 + 93760^2 .

It is a cyclic number.

It is not a de Polignac number, because 31125343409 - 2⁴ = 31125343393 is a prime.

It is not a weakly prime, because it can be changed into another prime (31125343489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562671704 + 15562671705.

It is an arithmetic number, because the mean of its divisors is an integer number (15562671705).

Almost surely, 2^31125343409 is an apocalyptic number.

It is an amenable number.

31125343409 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125343409 is an equidigital number, since it uses as much as digits as its factorization.

31125343409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 31125343409 in words is "thirty-one billion, one hundred twenty-five million, three hundred forty-three thousand, four hundred nine".