145942681 has 2 divisors, whose sum is σ = 145942682. Its totient is φ = 145942680.

The previous prime is 145942673. The next prime is 145942691. The reversal of 145942681 is 186249541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116294656 + 29648025 = 10784^2 + 5445^2 .

It is an emirp because it is prime and its reverse (186249541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145942681 - 2³ = 145942673 is a prime.

It is a super-2 number, since 2×145942681² = 42598532274935522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145942691) 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, 72971340 + 72971341.

It is an arithmetic number, because the mean of its divisors is an integer number (72971341).

Almost surely, 2^145942681 is an apocalyptic number.

It is an amenable number.

145942681 is a deficient number, since it is larger than the sum of its proper divisors (1).

145942681 is an equidigital number, since it uses as much as digits as its factorization.

145942681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 145942681 is about 12080.6738636551. The cubic root of 145942681 is about 526.4948248769.

The spelling of 145942681 in words is "one hundred forty-five million, nine hundred forty-two thousand, six hundred eighty-one".