145023491 has 2 divisors, whose sum is σ = 145023492. Its totient is φ = 145023490.

The previous prime is 145023421. The next prime is 145023497. The reversal of 145023491 is 194320541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145023491 - 2¹⁰ = 145022467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145023497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72511745 + 72511746.

It is an arithmetic number, because the mean of its divisors is an integer number (72511746).

Almost surely, 2^145023491 is an apocalyptic number.

145023491 is a deficient number, since it is larger than the sum of its proper divisors (1).

145023491 is an equidigital number, since it uses as much as digits as its factorization.

145023491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 145023491 is about 12042.5699499733. The cubic root of 145023491 is about 525.3871562996.

The spelling of 145023491 in words is "one hundred forty-five million, twenty-three thousand, four hundred ninety-one".