145555931 has 2 divisors, whose sum is σ = 145555932. Its totient is φ = 145555930.

The previous prime is 145555913. The next prime is 145555933. The reversal of 145555931 is 139555541.

It is a happy number.

Together with previous prime (145555913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145555931 - 2⁶ = 145555867 is a prime.

It is a super-2 number, since 2×145555931² = 42373058098553522, which contains 22 as substring.

Together with 145555933, 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 (145555933) 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, 72777965 + 72777966.

It is an arithmetic number, because the mean of its divisors is an integer number (72777966).

Almost surely, 2^145555931 is an apocalyptic number.

145555931 is a deficient number, since it is larger than the sum of its proper divisors (1).

145555931 is an equidigital number, since it uses as much as digits as its factorization.

145555931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67500, while the sum is 38.

The square root of 145555931 is about 12064.6562735952. The cubic root of 145555931 is about 526.0293407469.

The spelling of 145555931 in words is "one hundred forty-five million, five hundred fifty-five thousand, nine hundred thirty-one".