145240681 has 2 divisors, whose sum is σ = 145240682. Its totient is φ = 145240680.

The previous prime is 145240643. The next prime is 145240691. The reversal of 145240681 is 186042541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83083225 + 62157456 = 9115^2 + 7884^2 .

It is an emirp because it is prime and its reverse (186042541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145240681 is a prime.

It is a super-2 number, since 2×145240681² = 42189710834687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145240691) 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, 72620340 + 72620341.

It is an arithmetic number, because the mean of its divisors is an integer number (72620341).

Almost surely, 2^145240681 is an apocalyptic number.

It is an amenable number.

145240681 is a deficient number, since it is larger than the sum of its proper divisors (1).

145240681 is an equidigital number, since it uses as much as digits as its factorization.

145240681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 145240681 is about 12051.5841697264. The cubic root of 145240681 is about 525.6493021519.

The spelling of 145240681 in words is "one hundred forty-five million, two hundred forty thousand, six hundred eighty-one".