145117771 has 2 divisors, whose sum is σ = 145117772. Its totient is φ = 145117770.

The previous prime is 145117747. The next prime is 145117799. The reversal of 145117771 is 177711541.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145117771 - 2¹³ = 145109579 is a prime.

It is not a weakly prime, because it can be changed into another prime (145112771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72558885 + 72558886.

It is an arithmetic number, because the mean of its divisors is an integer number (72558886).

Almost surely, 2^145117771 is an apocalyptic number.

145117771 is a deficient number, since it is larger than the sum of its proper divisors (1).

145117771 is an equidigital number, since it uses as much as digits as its factorization.

145117771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6860, while the sum is 34.

The square root of 145117771 is about 12046.4837608325. The cubic root of 145117771 is about 525.5009833095.

The spelling of 145117771 in words is "one hundred forty-five million, one hundred seventeen thousand, seven hundred seventy-one".