31521645011 has 2 divisors, whose sum is σ = 31521645012. Its totient is φ = 31521645010.

The previous prime is 31521644981. The next prime is 31521645041. The reversal of 31521645011 is 11054612513.

It is a balanced prime because it is at equal distance from previous prime (31521644981) and next prime (31521645041).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31521645011 is a prime.

It is a super-2 number, since 2×31521645011² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31521645041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760822505 + 15760822506.

It is an arithmetic number, because the mean of its divisors is an integer number (15760822506).

Almost surely, 2^31521645011 is an apocalyptic number.

31521645011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31521645011 is an equidigital number, since it uses as much as digits as its factorization.

31521645011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 31521645011 in words is "thirty-one billion, five hundred twenty-one million, six hundred forty-five thousand, eleven".