145909913 has 2 divisors, whose sum is σ = 145909914. Its totient is φ = 145909912.

The previous prime is 145909837. The next prime is 145909921. The reversal of 145909913 is 319909541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104796169 + 41113744 = 10237^2 + 6412^2 .

It is a cyclic number.

It is not a de Polignac number, because 145909913 - 2¹² = 145905817 is a prime.

It is not a weakly prime, because it can be changed into another prime (145909993) 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, 72954956 + 72954957.

It is an arithmetic number, because the mean of its divisors is an integer number (72954957).

Almost surely, 2^145909913 is an apocalyptic number.

It is an amenable number.

145909913 is a deficient number, since it is larger than the sum of its proper divisors (1).

145909913 is an equidigital number, since it uses as much as digits as its factorization.

145909913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 145909913 is about 12079.3175717836. The cubic root of 145909913 is about 526.4554179133.

The spelling of 145909913 in words is "one hundred forty-five million, nine hundred nine thousand, nine hundred thirteen".