145621171 has 2 divisors, whose sum is σ = 145621172. Its totient is φ = 145621170.

The previous prime is 145621169. The next prime is 145621183. The reversal of 145621171 is 171126541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145621171 - 2¹ = 145621169 is a prime.

It is a super-2 number, since 2×145621171² = 42411050886822482, which contains 22 as substring.

Together with 145621169, 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 (145621771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810585 + 72810586.

It is an arithmetic number, because the mean of its divisors is an integer number (72810586).

Almost surely, 2^145621171 is an apocalyptic number.

145621171 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621171 is an equidigital number, since it uses as much as digits as its factorization.

145621171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 145621171 is about 12067.3597360815. The cubic root of 145621171 is about 526.1079199981.

The spelling of 145621171 in words is "one hundred forty-five million, six hundred twenty-one thousand, one hundred seventy-one".