145305691 has 2 divisors, whose sum is σ = 145305692. Its totient is φ = 145305690.

The previous prime is 145305637. The next prime is 145305737. The reversal of 145305691 is 196503541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145305691 - 2²⁵ = 111751259 is a prime.

It is a super-2 number, since 2×145305691² = 42227487673974962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145305491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72652845 + 72652846.

It is an arithmetic number, because the mean of its divisors is an integer number (72652846).

Almost surely, 2^145305691 is an apocalyptic number.

145305691 is a deficient number, since it is larger than the sum of its proper divisors (1).

145305691 is an equidigital number, since it uses as much as digits as its factorization.

145305691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 145305691 is about 12054.2810237691. The cubic root of 145305691 is about 525.7277176564.

The spelling of 145305691 in words is "one hundred forty-five million, three hundred five thousand, six hundred ninety-one".