145976021 has 2 divisors, whose sum is σ = 145976022. Its totient is φ = 145976020.

The previous prime is 145976011. The next prime is 145976027. The reversal of 145976021 is 120679541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98227921 + 47748100 = 9911^2 + 6910^2 .

It is an emirp because it is prime and its reverse (120679541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145976021 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 (145976027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72988010 + 72988011.

It is an arithmetic number, because the mean of its divisors is an integer number (72988011).

Almost surely, 2^145976021 is an apocalyptic number.

It is an amenable number.

145976021 is a deficient number, since it is larger than the sum of its proper divisors (1).

145976021 is an equidigital number, since it uses as much as digits as its factorization.

145976021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 145976021 is about 12082.0536747690. The cubic root of 145976021 is about 526.5349136772.

The spelling of 145976021 in words is "one hundred forty-five million, nine hundred seventy-six thousand, twenty-one".