31200123701 has 2 divisors, whose sum is σ = 31200123702. Its totient is φ = 31200123700.

The previous prime is 31200123697. The next prime is 31200123761. The reversal of 31200123701 is 10732100213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28348456900 + 2851666801 = 168370^2 + 53401^2 .

It is an emirp because it is prime and its reverse (10732100213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31200123701 - 2² = 31200123697 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200123761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600061850 + 15600061851.

It is an arithmetic number, because the mean of its divisors is an integer number (15600061851).

Almost surely, 2^31200123701 is an apocalyptic number.

It is an amenable number.

31200123701 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200123701 is an equidigital number, since it uses as much as digits as its factorization.

31200123701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

Adding to 31200123701 its reverse (10732100213), we get a palindrome (41932223914).

The spelling of 31200123701 in words is "thirty-one billion, two hundred million, one hundred twenty-three thousand, seven hundred one".