145681933 has 2 divisors, whose sum is σ = 145681934. Its totient is φ = 145681932.

The previous prime is 145681889. The next prime is 145681961. The reversal of 145681933 is 339186541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136843204 + 8838729 = 11698^2 + 2973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145681933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145681633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72840966 + 72840967.

It is an arithmetic number, because the mean of its divisors is an integer number (72840967).

Almost surely, 2^145681933 is an apocalyptic number.

It is an amenable number.

145681933 is a deficient number, since it is larger than the sum of its proper divisors (1).

145681933 is an equidigital number, since it uses as much as digits as its factorization.

145681933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 145681933 is about 12069.8770913378. The cubic root of 145681933 is about 526.1810845524.

The spelling of 145681933 in words is "one hundred forty-five million, six hundred eighty-one thousand, nine hundred thirty-three".