145715881 has 2 divisors, whose sum is σ = 145715882. Its totient is φ = 145715880.

The previous prime is 145715849. The next prime is 145715893. The reversal of 145715881 is 188517541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 10342656 = 11635^2 + 3216^2 .

It is a cyclic number.

It is not a de Polignac number, because 145715881 - 2⁵ = 145715849 is a prime.

It is a super-2 number, since 2×145715881² = 42466235951212322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145115881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72857940 + 72857941.

It is an arithmetic number, because the mean of its divisors is an integer number (72857941).

Almost surely, 2^145715881 is an apocalyptic number.

It is an amenable number.

145715881 is a deficient number, since it is larger than the sum of its proper divisors (1).

145715881 is an equidigital number, since it uses as much as digits as its factorization.

145715881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 40.

The square root of 145715881 is about 12071.2833203434. The cubic root of 145715881 is about 526.2219530568.

The spelling of 145715881 in words is "one hundred forty-five million, seven hundred fifteen thousand, eight hundred eighty-one".