145204021181 has 2 divisors, whose sum is σ = 145204021182. Its totient is φ = 145204021180.

The previous prime is 145204021169. The next prime is 145204021211. The reversal of 145204021181 is 181120402541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132940452100 + 12263569081 = 364610^2 + 110741^2 .

It is a cyclic number.

It is not a de Polignac number, because 145204021181 - 2⁶ = 145204021117 is a prime.

It is a super-2 number, since 2×145204021181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145204221181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72602010590 + 72602010591.

It is an arithmetic number, because the mean of its divisors is an integer number (72602010591).

Almost surely, 2^145204021181 is an apocalyptic number.

It is an amenable number.

145204021181 is a deficient number, since it is larger than the sum of its proper divisors (1).

145204021181 is an equidigital number, since it uses as much as digits as its factorization.

145204021181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2560, while the sum is 29.

The spelling of 145204021181 in words is "one hundred forty-five billion, two hundred four million, twenty-one thousand, one hundred eighty-one".