145371931 has 2 divisors, whose sum is σ = 145371932. Its totient is φ = 145371930.

The previous prime is 145371881. The next prime is 145371959. The reversal of 145371931 is 139173541.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145371931 - 2¹¹ = 145369883 is a prime.

It is a super-2 number, since 2×145371931² = 42265996645337522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145371971) 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, 72685965 + 72685966.

It is an arithmetic number, because the mean of its divisors is an integer number (72685966).

Almost surely, 2^145371931 is an apocalyptic number.

145371931 is a deficient number, since it is larger than the sum of its proper divisors (1).

145371931 is an equidigital number, since it uses as much as digits as its factorization.

145371931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 145371931 is about 12057.0282822924. The cubic root of 145371931 is about 525.8075927423.

The spelling of 145371931 in words is "one hundred forty-five million, three hundred seventy-one thousand, nine hundred thirty-one".