145857181 has 2 divisors, whose sum is σ = 145857182.
Its totient is φ = 145857180.
The previous prime is 145857097. The next prime is 145857193. The reversal of 145857181 is 181758541.
145857181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 127012900 + 18844281 = 11270^2 + 4341^2
It is a cyclic number.
It is not a de Polignac number, because 145857181 - 211 = 145855133 is a prime.
It is a super-2 number, since 2×1458571812 = 42548634498533522, which contains 22 as substring.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (145857581) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72928590 + 72928591.
It is an arithmetic number, because the mean of its divisors is an integer number (72928591).
Almost surely, 2145857181 is an apocalyptic number.
145857181 is the 6456-th centered heptagonal number.
It is an amenable number.
145857181 is a deficient number, since it is larger than the sum of its proper divisors (1).
145857181 is an equidigital number, since it uses as much as digits as its factorization.
145857181 is an evil number, because the sum of its binary digits is even.
The product of its digits is 44800, while the sum is 40.
The square root of 145857181 is about 12077.1346353347.
The cubic root of 145857181 is about 526.3919897529.
The spelling of 145857181 in words is "one hundred forty-five million, eight hundred fifty-seven thousand, one hundred eighty-one".