145621169 has 2 divisors, whose sum is σ = 145621170. Its totient is φ = 145621168.

The previous prime is 145621163. The next prime is 145621171. The reversal of 145621169 is 961126541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133287025 + 12334144 = 11545^2 + 3512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145621169 is a prime.

It is a super-2 number, since 2×145621169² = 42411049721853122, which contains 22 as substring.

Together with 145621171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145621163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810584 + 72810585.

It is an arithmetic number, because the mean of its divisors is an integer number (72810585).

Almost surely, 2^145621169 is an apocalyptic number.

It is an amenable number.

145621169 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621169 is an equidigital number, since it uses as much as digits as its factorization.

145621169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 145621169 is about 12067.3596532133. The cubic root of 145621169 is about 526.1079175896.

The spelling of 145621169 in words is "one hundred forty-five million, six hundred twenty-one thousand, one hundred sixty-nine".