145371971 has 2 divisors, whose sum is σ = 145371972. Its totient is φ = 145371970.

The previous prime is 145371959. The next prime is 145371973. The reversal of 145371971 is 179173541.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145371971 is a prime.

It is a super-2 number, since 2×145371971² = 42266019904849682, which contains 22 as substring.

Together with 145371973, 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 (145371973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72685985 + 72685986.

It is an arithmetic number, because the mean of its divisors is an integer number (72685986).

Almost surely, 2^145371971 is an apocalyptic number.

145371971 is a deficient number, since it is larger than the sum of its proper divisors (1).

145371971 is an equidigital number, since it uses as much as digits as its factorization.

145371971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 145371971 is about 12057.0299410759. The cubic root of 145371971 is about 525.8076409687.

The spelling of 145371971 in words is "one hundred forty-five million, three hundred seventy-one thousand, nine hundred seventy-one".