145255681 has 2 divisors, whose sum is σ = 145255682. Its totient is φ = 145255680.

The previous prime is 145255637. The next prime is 145255687. The reversal of 145255681 is 186552541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140778225 + 4477456 = 11865^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 145255681 - 2¹³ = 145247489 is a prime.

It is a super-2 number, since 2×145255681² = 42198425725547522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145255681.

It is not a weakly prime, because it can be changed into another prime (145255687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72627840 + 72627841.

It is an arithmetic number, because the mean of its divisors is an integer number (72627841).

Almost surely, 2^145255681 is an apocalyptic number.

It is an amenable number.

145255681 is a deficient number, since it is larger than the sum of its proper divisors (1).

145255681 is an equidigital number, since it uses as much as digits as its factorization.

145255681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48000, while the sum is 37.

The square root of 145255681 is about 12052.2064784835. The cubic root of 145255681 is about 525.6673973303.

The spelling of 145255681 in words is "one hundred forty-five million, two hundred fifty-five thousand, six hundred eighty-one".