145381931 has 2 divisors, whose sum is σ = 145381932. Its totient is φ = 145381930.

The previous prime is 145381921. The next prime is 145381933. The reversal of 145381931 is 139183541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145381931 - 2¹⁴ = 145365547 is a prime.

It is a super-2 number, since 2×145381931² = 42271811722577522, which contains 22 as substring.

Together with 145381933, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 145381891 and 145381900.

It is not a weakly prime, because it can be changed into another prime (145381933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72690965 + 72690966.

It is an arithmetic number, because the mean of its divisors is an integer number (72690966).

Almost surely, 2^145381931 is an apocalyptic number.

145381931 is a deficient number, since it is larger than the sum of its proper divisors (1).

145381931 is an equidigital number, since it uses as much as digits as its factorization.

145381931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 145381931 is about 12057.4429710449. The cubic root of 145381931 is about 525.8196490710.

The spelling of 145381931 in words is "one hundred forty-five million, three hundred eighty-one thousand, nine hundred thirty-one".