71445523531 has 2 divisors, whose sum is σ = 71445523532. Its totient is φ = 71445523530.

The previous prime is 71445523519. The next prime is 71445523559. The reversal of 71445523531 is 13532554417.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71445523531 - 2⁷ = 71445523403 is a prime.

It is a super-2 number, since 2×71445523531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71445523031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35722761765 + 35722761766.

It is an arithmetic number, because the mean of its divisors is an integer number (35722761766).

Almost surely, 2^71445523531 is an apocalyptic number.

71445523531 is a deficient number, since it is larger than the sum of its proper divisors (1).

71445523531 is an equidigital number, since it uses as much as digits as its factorization.

71445523531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 40.

The spelling of 71445523531 in words is "seventy-one billion, four hundred forty-five million, five hundred twenty-three thousand, five hundred thirty-one".