1521311951 has 2 divisors, whose sum is σ = 1521311952. Its totient is φ = 1521311950.

The previous prime is 1521311941. The next prime is 1521311999. The reversal of 1521311951 is 1591131251.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1521311951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521311941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760655975 + 760655976.

It is an arithmetic number, because the mean of its divisors is an integer number (760655976).

Almost surely, 2^1521311951 is an apocalyptic number.

1521311951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521311951 is an equidigital number, since it uses as much as digits as its factorization.

1521311951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 29.

The square root of 1521311951 is about 39003.9991667521. Note that the first 3 decimals coincide. The cubic root of 1521311951 is about 1150.1101220318.

The spelling of 1521311951 in words is "one billion, five hundred twenty-one million, three hundred eleven thousand, nine hundred fifty-one".