145469491 has 6 divisors (see below), whose sum is σ = 153181140. Its totient is φ = 137763396.

The previous prime is 145469479. The next prime is 145469497. The reversal of 145469491 is 194964541.

It is not a de Polignac number, because 145469491 - 2¹⁵ = 145436723 is a prime.

It is a super-2 number, since 2×145469491² = 42322745623598162, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (145469497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51190 + ... + 53956.

It is an arithmetic number, because the mean of its divisors is an integer number (25530190).

Almost surely, 2^145469491 is an apocalyptic number.

145469491 is a deficient number, since it is larger than the sum of its proper divisors (7711649).

145469491 is an frugal number, since it uses more digits than its factorization.

145469491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553 (or 2786 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 145469491 is about 12061.0733767770. The cubic root of 145469491 is about 525.9251906794.

The spelling of 145469491 in words is "one hundred forty-five million, four hundred sixty-nine thousand, four hundred ninety-one".