145371973 has 2 divisors, whose sum is σ = 145371974. Its totient is φ = 145371972.

The previous prime is 145371971. The next prime is 145371979. The reversal of 145371973 is 379173541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143568324 + 1803649 = 11982^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 145371973 - 2¹ = 145371971 is a prime.

It is a super-2 number, since 2×145371973² = 42266021067825458, which contains 22 as substring.

Together with 145371971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145371971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72685986 + 72685987.

It is an arithmetic number, because the mean of its divisors is an integer number (72685987).

Almost surely, 2^145371973 is an apocalyptic number.

It is an amenable number.

145371973 is a deficient number, since it is larger than the sum of its proper divisors (1).

145371973 is an equidigital number, since it uses as much as digits as its factorization.

145371973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 145371973 is about 12057.0300240150. The cubic root of 145371973 is about 525.8076433800.

The spelling of 145371973 in words is "one hundred forty-five million, three hundred seventy-one thousand, nine hundred seventy-three".