145831457 has 4 divisors (see below), whose sum is σ = 154409796. Its totient is φ = 137253120.

The previous prime is 145831451. The next prime is 145831481. The reversal of 145831457 is 754138541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 113124496 + 32706961 = 10636^2 + 5719^2 .

It is a cyclic number.

It is not a de Polignac number, because 145831457 - 2¹² = 145827361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145831457.

It is not an unprimeable number, because it can be changed into a prime (145831451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4289144 + ... + 4289177.

It is an arithmetic number, because the mean of its divisors is an integer number (38602449).

Almost surely, 2^145831457 is an apocalyptic number.

145831457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

145831457 is a deficient number, since it is larger than the sum of its proper divisors (8578339).

145831457 is an equidigital number, since it uses as much as digits as its factorization.

145831457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8578338.

The product of its digits is 67200, while the sum is 38.

The square root of 145831457 is about 12076.0696006606. The cubic root of 145831457 is about 526.3610423481.

Adding to 145831457 its reverse (754138541), we get a palindrome (899969998).

The spelling of 145831457 in words is "one hundred forty-five million, eight hundred thirty-one thousand, four hundred fifty-seven".