145857831 has 8 divisors (see below), whose sum is σ = 222259584. Its totient is φ = 83347320.

The previous prime is 145857797. The next prime is 145857839. The reversal of 145857831 is 138758541.

145857831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 145857831 - 2¹⁵ = 145825063 is a prime.

It is a super-2 number, since 2×145857831² = 42549013728049122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145857839) 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, 3472785 + ... + 3472826.

It is an arithmetic number, because the mean of its divisors is an integer number (27782448).

Almost surely, 2^145857831 is an apocalyptic number.

145857831 is a deficient number, since it is larger than the sum of its proper divisors (76401753).

145857831 is an equidigital number, since it uses as much as digits as its factorization.

145857831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6945621.

The product of its digits is 134400, while the sum is 42.

The square root of 145857831 is about 12077.1615456613. The cubic root of 145857831 is about 526.3927716920.

The spelling of 145857831 in words is "one hundred forty-five million, eight hundred fifty-seven thousand, eight hundred thirty-one".