145816581 has 8 divisors (see below), whose sum is σ = 194477920. Its totient is φ = 97183152.

The previous prime is 145816579. The next prime is 145816597. The reversal of 145816581 is 185618541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145816581 - 2¹ = 145816579 is a prime.

It is a super-2 number, since 2×145816581² = 42524950589059122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145816381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16590 + ... + 23808.

It is an arithmetic number, because the mean of its divisors is an integer number (24309740).

Almost surely, 2^145816581 is an apocalyptic number.

It is an amenable number.

145816581 is a deficient number, since it is larger than the sum of its proper divisors (48661339).

145816581 is an equidigital number, since it uses as much as digits as its factorization.

145816581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13955.

The product of its digits is 38400, while the sum is 39.

The square root of 145816581 is about 12075.4536560744. The cubic root of 145816581 is about 526.3431440307.

The spelling of 145816581 in words is "one hundred forty-five million, eight hundred sixteen thousand, five hundred eighty-one".