145713121 has 2 divisors, whose sum is σ = 145713122. Its totient is φ = 145713120.

The previous prime is 145713101. The next prime is 145713131. The reversal of 145713121 is 121317541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101304225 + 44408896 = 10065^2 + 6664^2 .

It is an emirp because it is prime and its reverse (121317541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145713121 is a prime.

It is not a weakly prime, because it can be changed into another prime (145713101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72856560 + 72856561.

It is an arithmetic number, because the mean of its divisors is an integer number (72856561).

Almost surely, 2^145713121 is an apocalyptic number.

It is an amenable number.

145713121 is a deficient number, since it is larger than the sum of its proper divisors (1).

145713121 is an equidigital number, since it uses as much as digits as its factorization.

145713121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 145713121 is about 12071.1689988998. The cubic root of 145713121 is about 526.2186306512.

The spelling of 145713121 in words is "one hundred forty-five million, seven hundred thirteen thousand, one hundred twenty-one".