145610581 has 2 divisors, whose sum is σ = 145610582. Its totient is φ = 145610580.

The previous prime is 145610567. The next prime is 145610609. The reversal of 145610581 is 185016541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82264900 + 63345681 = 9070^2 + 7959^2 .

It is an emirp because it is prime and its reverse (185016541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145610581 - 2¹³ = 145602389 is a prime.

It is a super-2 number, since 2×145610581² = 42404882598315122, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145610551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72805290 + 72805291.

It is an arithmetic number, because the mean of its divisors is an integer number (72805291).

Almost surely, 2^145610581 is an apocalyptic number.

It is an amenable number.

145610581 is a deficient number, since it is larger than the sum of its proper divisors (1).

145610581 is an equidigital number, since it uses as much as digits as its factorization.

145610581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 145610581 is about 12066.9209411515. The cubic root of 145610581 is about 526.0951663170.

The spelling of 145610581 in words is "one hundred forty-five million, six hundred ten thousand, five hundred eighty-one".