145431101521 has 2 divisors, whose sum is σ = 145431101522. Its totient is φ = 145431101520.

The previous prime is 145431101447. The next prime is 145431101531. The reversal of 145431101521 is 125101134541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76527476496 + 68903625025 = 276636^2 + 262495^2 .

It is a cyclic number.

It is not a de Polignac number, because 145431101521 - 2⁷ = 145431101393 is a prime.

It is a super-2 number, since 2×145431101521² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145431101521.

It is not a weakly prime, because it can be changed into another prime (145431101531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72715550760 + 72715550761.

It is an arithmetic number, because the mean of its divisors is an integer number (72715550761).

Almost surely, 2^145431101521 is an apocalyptic number.

It is an amenable number.

145431101521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145431101521 is an equidigital number, since it uses as much as digits as its factorization.

145431101521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The spelling of 145431101521 in words is "one hundred forty-five billion, four hundred thirty-one million, one hundred one thousand, five hundred twenty-one".