145242899 has 4 divisors (see below), whose sum is σ = 145384536. Its totient is φ = 145101264.

The previous prime is 145242887. The next prime is 145242901. The reversal of 145242899 is 998242541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998242541 = 47 ⋅21239203.

It is a cyclic number.

It is not a de Polignac number, because 145242899 - 2²⁴ = 128465683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145242809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69269 + ... + 71334.

It is an arithmetic number, because the mean of its divisors is an integer number (36346134).

Almost surely, 2^145242899 is an apocalyptic number.

145242899 is a deficient number, since it is larger than the sum of its proper divisors (141637).

145242899 is a wasteful number, since it uses less digits than its factorization.

145242899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141636.

The product of its digits is 207360, while the sum is 44.

The square root of 145242899 is about 12051.6761904724. The cubic root of 145242899 is about 525.6519779041.

The spelling of 145242899 in words is "one hundred forty-five million, two hundred forty-two thousand, eight hundred ninety-nine".