145431257 has 8 divisors (see below), whose sum is σ = 147634440. Its totient is φ = 143233920.

The previous prime is 145431241. The next prime is 145431281. The reversal of 145431257 is 752134541.

145431257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 89794576 + 55636681 = 9476^2 + 7459^2 .

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 145431257 - 2⁴ = 145431241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145431287) 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, 88907 + ... + 90527.

It is an arithmetic number, because the mean of its divisors is an integer number (18454305).

Almost surely, 2^145431257 is an apocalyptic number.

It is an amenable number.

145431257 is a deficient number, since it is larger than the sum of its proper divisors (2203183).

145431257 is a wasteful number, since it uses less digits than its factorization.

145431257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923.

The product of its digits is 16800, while the sum is 32.

The square root of 145431257 is about 12059.4882561409. The cubic root of 145431257 is about 525.8791100303.

Adding to 145431257 its reverse (752134541), we get a palindrome (897565798).

The spelling of 145431257 in words is "one hundred forty-five million, four hundred thirty-one thousand, two hundred fifty-seven".