145249881 has 16 divisors (see below), whose sum is σ = 226043904. Its totient is φ = 81233424.

The previous prime is 145249859. The next prime is 145249933. The reversal of 145249881 is 188942541.

It is not a de Polignac number, because 145249881 - 2¹⁸ = 144987737 is a prime.

It is a super-2 number, since 2×145249881² = 42195055861028322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145249381) 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, 72595 + ... + 74568.

It is an arithmetic number, because the mean of its divisors is an integer number (14127744).

Almost surely, 2^145249881 is an apocalyptic number.

It is an amenable number.

145249881 is a deficient number, since it is larger than the sum of its proper divisors (80794023).

145249881 is a wasteful number, since it uses less digits than its factorization.

145249881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147220.

The product of its digits is 92160, while the sum is 42.

The square root of 145249881 is about 12051.9658562410. The cubic root of 145249881 is about 525.6604006757.

The spelling of 145249881 in words is "one hundred forty-five million, two hundred forty-nine thousand, eight hundred eighty-one".