31215215142401 has 4 divisors (see below), whose sum is σ = 31565947896900. Its totient is φ = 30864482387904.

The previous prime is 31215215142383. The next prime is 31215215142409. The reversal of 31215215142401 is 10424151251213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2798042380225 + 28417172762176 = 1672735^2 + 5330776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31215215142401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31215215142409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175366377116 + ... + 175366377293.

It is an arithmetic number, because the mean of its divisors is an integer number (7891486974225).

Almost surely, 2^{31215215142401} is an apocalyptic number.

It is an amenable number.

31215215142401 is a deficient number, since it is larger than the sum of its proper divisors (350732754499).

31215215142401 is an equidigital number, since it uses as much as digits as its factorization.

31215215142401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350732754498.

The product of its (nonzero) digits is 9600, while the sum is 32.

Adding to 31215215142401 its reverse (10424151251213), we get a palindrome (41639366393614).

The spelling of 31215215142401 in words is "thirty-one trillion, two hundred fifteen billion, two hundred fifteen million, one hundred forty-two thousand, four hundred one".