145371881 has 2 divisors, whose sum is σ = 145371882. Its totient is φ = 145371880.

The previous prime is 145371859. The next prime is 145371931. The reversal of 145371881 is 188173541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143616256 + 1755625 = 11984^2 + 1325^2 .

It is an emirp because it is prime and its reverse (188173541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145371881 - 2⁶ = 145371817 is a prime.

It is a super-2 number, since 2×145371881² = 42265967570956322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145371181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72685940 + 72685941.

It is an arithmetic number, because the mean of its divisors is an integer number (72685941).

Almost surely, 2^145371881 is an apocalyptic number.

It is an amenable number.

145371881 is a deficient number, since it is larger than the sum of its proper divisors (1).

145371881 is an equidigital number, since it uses as much as digits as its factorization.

145371881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 145371881 is about 12057.0262088129. The cubic root of 145371881 is about 525.8075324592.

The spelling of 145371881 in words is "one hundred forty-five million, three hundred seventy-one thousand, eight hundred eighty-one".