31521411001 has 2 divisors, whose sum is σ = 31521411002. Its totient is φ = 31521411000.

The previous prime is 31521410983. The next prime is 31521411017. The reversal of 31521411001 is 10011412513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23013193401 + 8508217600 = 151701^2 + 92240^2 .

It is a cyclic number.

It is not a de Polignac number, because 31521411001 - 2¹¹ = 31521408953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31521411001.

It is not a weakly prime, because it can be changed into another prime (31521411091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760705500 + 15760705501.

It is an arithmetic number, because the mean of its divisors is an integer number (15760705501).

Almost surely, 2^31521411001 is an apocalyptic number.

It is an amenable number.

31521411001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31521411001 is an equidigital number, since it uses as much as digits as its factorization.

31521411001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 31521411001 its reverse (10011412513), we get a palindrome (41532823514).

The spelling of 31521411001 in words is "thirty-one billion, five hundred twenty-one million, four hundred eleven thousand, one".