145531021605 has 32 divisors (see below), whose sum is σ = 237848776704. Its totient is φ = 75950788416.

The previous prime is 145531021591. The next prime is 145531021621. The reversal of 145531021605 is 506120135541.

It is not a de Polignac number, because 145531021605 - 2¹² = 145531017509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4441392 + ... + 4474038.

It is an arithmetic number, because the mean of its divisors is an integer number (7432774272).

Almost surely, 2^145531021605 is an apocalyptic number.

145531021605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145531021605 is a deficient number, since it is larger than the sum of its proper divisors (92317755099).

145531021605 is a wasteful number, since it uses less digits than its factorization.

145531021605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39025.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 145531021605 in words is "one hundred forty-five billion, five hundred thirty-one million, twenty-one thousand, six hundred five".