145307693 has 2 divisors, whose sum is σ = 145307694. Its totient is φ = 145307692.

The previous prime is 145307663. The next prime is 145307713. The reversal of 145307693 is 396703541.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130462084 + 14845609 = 11422^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 145307693 - 2¹⁶ = 145242157 is a prime.

It is a super-2 number, since 2×145307693² = 42228651289964498, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145307663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72653846 + 72653847.

It is an arithmetic number, because the mean of its divisors is an integer number (72653847).

Almost surely, 2^145307693 is an apocalyptic number.

It is an amenable number.

145307693 is a deficient number, since it is larger than the sum of its proper divisors (1).

145307693 is an equidigital number, since it uses as much as digits as its factorization.

145307693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 145307693 is about 12054.3640645204. The cubic root of 145307693 is about 525.7301321112.

The spelling of 145307693 in words is "one hundred forty-five million, three hundred seven thousand, six hundred ninety-three".