145719491 has 2 divisors, whose sum is σ = 145719492. Its totient is φ = 145719490.

The previous prime is 145719487. The next prime is 145719503. The reversal of 145719491 is 194917541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145719491 - 2² = 145719487 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145719391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72859745 + 72859746.

It is an arithmetic number, because the mean of its divisors is an integer number (72859746).

Almost surely, 2^145719491 is an apocalyptic number.

145719491 is a deficient number, since it is larger than the sum of its proper divisors (1).

145719491 is an equidigital number, since it uses as much as digits as its factorization.

145719491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 145719491 is about 12071.4328478437. The cubic root of 145719491 is about 526.2262986036.

The spelling of 145719491 in words is "one hundred forty-five million, seven hundred nineteen thousand, four hundred ninety-one".