145715521531 has 2 divisors, whose sum is σ = 145715521532. Its totient is φ = 145715521530.

The previous prime is 145715521517. The next prime is 145715521541. The reversal of 145715521531 is 135125517541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145715521531 - 2⁵ = 145715521499 is a prime.

It is a super-2 number, since 2×145715521531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145715521541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72857760765 + 72857760766.

It is an arithmetic number, because the mean of its divisors is an integer number (72857760766).

Almost surely, 2^145715521531 is an apocalyptic number.

145715521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

145715521531 is an equidigital number, since it uses as much as digits as its factorization.

145715521531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105000, while the sum is 40.

The spelling of 145715521531 in words is "one hundred forty-five billion, seven hundred fifteen million, five hundred twenty-one thousand, five hundred thirty-one".