145245121351531 has 4 divisors (see below), whose sum is σ = 146683191860064. Its totient is φ = 143807050843000.

The previous prime is 145245121351493. The next prime is 145245121351633. The reversal of 145245121351531 is 135153121542541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145245121351531 is a prime.

It is a super-2 number, since 2×145245121351531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145245121051531) 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 in 3 ways as a sum of consecutive naturals, for example, 719035254115 + ... + 719035254316.

It is an arithmetic number, because the mean of its divisors is an integer number (36670797965016).

Almost surely, 2^{145245121351531} is an apocalyptic number.

145245121351531 is a deficient number, since it is larger than the sum of its proper divisors (1438070508533).

145245121351531 is a wasteful number, since it uses less digits than its factorization.

145245121351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438070508532.

The product of its digits is 360000, while the sum is 43.

The spelling of 145245121351531 in words is "one hundred forty-five trillion, two hundred forty-five billion, one hundred twenty-one million, three hundred fifty-one thousand, five hundred thirty-one".