145619861 has 2 divisors, whose sum is σ = 145619862. Its totient is φ = 145619860.

The previous prime is 145619843. The next prime is 145619867. The reversal of 145619861 is 168916541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120318961 + 25300900 = 10969^2 + 5030^2 .

It is a cyclic number.

It is not a de Polignac number, because 145619861 - 2⁶ = 145619797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145619867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72809930 + 72809931.

It is an arithmetic number, because the mean of its divisors is an integer number (72809931).

Almost surely, 2^145619861 is an apocalyptic number.

It is an amenable number.

145619861 is a deficient number, since it is larger than the sum of its proper divisors (1).

145619861 is an equidigital number, since it uses as much as digits as its factorization.

145619861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 145619861 is about 12067.3054573090. The cubic root of 145619861 is about 526.1063423808.

The spelling of 145619861 in words is "one hundred forty-five million, six hundred nineteen thousand, eight hundred sixty-one".