145399081 has 2 divisors, whose sum is σ = 145399082. Its totient is φ = 145399080.

The previous prime is 145399043. The next prime is 145399099. The reversal of 145399081 is 180993541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128051856 + 17347225 = 11316^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 145399081 - 2²³ = 137010473 is a prime.

It is a super-2 number, since 2×145399081² = 42281785511289122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145399481) 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, 72699540 + 72699541.

It is an arithmetic number, because the mean of its divisors is an integer number (72699541).

Almost surely, 2^145399081 is an apocalyptic number.

It is an amenable number.

145399081 is a deficient number, since it is larger than the sum of its proper divisors (1).

145399081 is an equidigital number, since it uses as much as digits as its factorization.

145399081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 145399081 is about 12058.1541290531. The cubic root of 145399081 is about 525.8403243877.

The spelling of 145399081 in words is "one hundred forty-five million, three hundred ninety-nine thousand, eighty-one".