72521719031 has 2 divisors, whose sum is σ = 72521719032. Its totient is φ = 72521719030.

The previous prime is 72521719009. The next prime is 72521719043. The reversal of 72521719031 is 13091712527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72521719031 is a prime.

It is a super-2 number, since 2×72521719031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72521719631) 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, 36260859515 + 36260859516.

It is an arithmetic number, because the mean of its divisors is an integer number (36260859516).

Almost surely, 2^72521719031 is an apocalyptic number.

72521719031 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521719031 is an equidigital number, since it uses as much as digits as its factorization.

72521719031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 72521719031 in words is "seventy-two billion, five hundred twenty-one million, seven hundred nineteen thousand, thirty-one".