145287931 has 8 divisors (see below), whose sum is σ = 147954240. Its totient is φ = 142643592.

The previous prime is 145287911. The next prime is 145287949. The reversal of 145287931 is 139782541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145287931 - 2¹⁷ = 145156859 is a prime.

It is a super-2 number, since 2×145287931² = 42217165788521522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145287911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8160 + ... + 18898.

It is an arithmetic number, because the mean of its divisors is an integer number (18494280).

Almost surely, 2^145287931 is an apocalyptic number.

145287931 is a deficient number, since it is larger than the sum of its proper divisors (2666309).

145287931 is a wasteful number, since it uses less digits than its factorization.

145287931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985.

The product of its digits is 60480, while the sum is 40.

The square root of 145287931 is about 12053.5443335145. The cubic root of 145287931 is about 525.7062977459.

The spelling of 145287931 in words is "one hundred forty-five million, two hundred eighty-seven thousand, nine hundred thirty-one".