145393931 has 2 divisors, whose sum is σ = 145393932. Its totient is φ = 145393930.

The previous prime is 145393883. The next prime is 145393933. The reversal of 145393931 is 139393541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145393931 - 2⁶ = 145393867 is a prime.

It is a super-2 number, since 2×145393931² = 42278790343265522, which contains 22 as substring.

Together with 145393933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145393933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72696965 + 72696966.

It is an arithmetic number, because the mean of its divisors is an integer number (72696966).

Almost surely, 2^145393931 is an apocalyptic number.

145393931 is a deficient number, since it is larger than the sum of its proper divisors (1).

145393931 is an equidigital number, since it uses as much as digits as its factorization.

145393931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 145393931 is about 12057.9405787224. The cubic root of 145393931 is about 525.8341159357.

The spelling of 145393931 in words is "one hundred forty-five million, three hundred ninety-three thousand, nine hundred thirty-one".