146689993 has 2 divisors, whose sum is σ = 146689994. Its totient is φ = 146689992.

The previous prime is 146689979. The next prime is 146689997. The reversal of 146689993 is 399986641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140944384 + 5745609 = 11872^2 + 2397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146689993 is a prime.

It is not a weakly prime, because it can be changed into another prime (146689997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73344996 + 73344997.

It is an arithmetic number, because the mean of its divisors is an integer number (73344997).

Almost surely, 2^146689993 is an apocalyptic number.

It is an amenable number.

146689993 is a deficient number, since it is larger than the sum of its proper divisors (1).

146689993 is an equidigital number, since it uses as much as digits as its factorization.

146689993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 55.

The square root of 146689993 is about 12111.5644323927. The cubic root of 146689993 is about 527.3919492981.

The spelling of 146689993 in words is "one hundred forty-six million, six hundred eighty-nine thousand, nine hundred ninety-three".