145198491 has 16 divisors (see below), whose sum is σ = 195719328. Its totient is φ = 95744000.

The previous prime is 145198489. The next prime is 145198499. The reversal of 145198491 is 194891541.

It is a cyclic number.

It is not a de Polignac number, because 145198491 - 2¹ = 145198489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145198499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164371 + ... + 165251.

It is an arithmetic number, because the mean of its divisors is an integer number (12232458).

Almost surely, 2^145198491 is an apocalyptic number.

145198491 is a deficient number, since it is larger than the sum of its proper divisors (50520837).

145198491 is a wasteful number, since it uses less digits than its factorization.

145198491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422.

The product of its digits is 51840, while the sum is 42.

The square root of 145198491 is about 12049.8336503041. The cubic root of 145198491 is about 525.5983997655.

The spelling of 145198491 in words is "one hundred forty-five million, one hundred ninety-eight thousand, four hundred ninety-one".