145816381 has 2 divisors, whose sum is σ = 145816382. Its totient is φ = 145816380.

The previous prime is 145816357. The next prime is 145816387. The reversal of 145816381 is 183618541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145419481 + 396900 = 12059^2 + 630^2 .

It is a cyclic number.

It is not a de Polignac number, because 145816381 - 2⁹ = 145815869 is a prime.

It is a super-2 number, since 2×145816381² = 42524833935874322, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 145816381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145816387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72908190 + 72908191.

It is an arithmetic number, because the mean of its divisors is an integer number (72908191).

Almost surely, 2^145816381 is an apocalyptic number.

It is an amenable number.

145816381 is a deficient number, since it is larger than the sum of its proper divisors (1).

145816381 is an equidigital number, since it uses as much as digits as its factorization.

145816381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 145816381 is about 12075.4453748092. The cubic root of 145816381 is about 526.3429033890.

The spelling of 145816381 in words is "one hundred forty-five million, eight hundred sixteen thousand, three hundred eighty-one".