145915661 has 2 divisors, whose sum is σ = 145915662. Its totient is φ = 145915660.

The previous prime is 145915633. The next prime is 145915669. The reversal of 145915661 is 166519541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127554436 + 18361225 = 11294^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 145915661 - 2²² = 141721357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145915669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72957830 + 72957831.

It is an arithmetic number, because the mean of its divisors is an integer number (72957831).

Almost surely, 2^145915661 is an apocalyptic number.

It is an amenable number.

145915661 is a deficient number, since it is larger than the sum of its proper divisors (1).

145915661 is an equidigital number, since it uses as much as digits as its factorization.

145915661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 145915661 is about 12079.5554967888. Note that the first 3 decimals coincide. The cubic root of 145915661 is about 526.4623309140.

The spelling of 145915661 in words is "one hundred forty-five million, nine hundred fifteen thousand, six hundred sixty-one".