145531252 has 6 divisors (see below), whose sum is σ = 254679698. Its totient is φ = 72765624.

The previous prime is 145531247. The next prime is 145531261. The reversal of 145531252 is 252135541.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 23561316 = 11044^2 + 4854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 145531252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18191403 + ... + 18191410.

Almost surely, 2^145531252 is an apocalyptic number.

It is an amenable number.

145531252 is a deficient number, since it is larger than the sum of its proper divisors (109148446).

145531252 is a wasteful number, since it uses less digits than its factorization.

145531252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36382817 (or 36382815 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 145531252 is about 12063.6334493386. The cubic root of 145531252 is about 525.9996096514. Note that the first 3 decimals are identical.

Adding to 145531252 its reverse (252135541), we get a palindrome (397666793).

The spelling of 145531252 in words is "one hundred forty-five million, five hundred thirty-one thousand, two hundred fifty-two".