145709381 has 2 divisors, whose sum is σ = 145709382. Its totient is φ = 145709380.

The previous prime is 145709371. The next prime is 145709407. The reversal of 145709381 is 183907541.

145709381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133772356 + 11937025 = 11566^2 + 3455^2 .

It is an emirp because it is prime and its reverse (183907541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145709381 is a prime.

It is a super-2 number, since 2×145709381² = 42462447422806322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145709321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72854690 + 72854691.

It is an arithmetic number, because the mean of its divisors is an integer number (72854691).

Almost surely, 2^145709381 is an apocalyptic number.

It is an amenable number.

145709381 is a deficient number, since it is larger than the sum of its proper divisors (1).

145709381 is an equidigital number, since it uses as much as digits as its factorization.

145709381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 145709381 is about 12071.0140833320. The cubic root of 145709381 is about 526.2141284840.

The spelling of 145709381 in words is "one hundred forty-five million, seven hundred nine thousand, three hundred eighty-one".