145856831 has 4 divisors (see below), whose sum is σ = 147703200. Its totient is φ = 144010464.

The previous prime is 145856783. The next prime is 145856873. The reversal of 145856831 is 138658541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145856831 - 2¹⁰ = 145855807 is a prime.

It is a super-2 number, since 2×145856831² = 42548430298725122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145852831) 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, 923066 + ... + 923223.

It is an arithmetic number, because the mean of its divisors is an integer number (36925800).

Almost surely, 2^145856831 is an apocalyptic number.

145856831 is a deficient number, since it is larger than the sum of its proper divisors (1846369).

145856831 is an equidigital number, since it uses as much as digits as its factorization.

145856831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846368.

The product of its digits is 115200, while the sum is 41.

The square root of 145856831 is about 12077.1201451339. The cubic root of 145856831 is about 526.3915687079.

The spelling of 145856831 in words is "one hundred forty-five million, eight hundred fifty-six thousand, eight hundred thirty-one".