145021251 has 4 divisors (see below), whose sum is σ = 193361672. Its totient is φ = 96680832.

The previous prime is 145021231. The next prime is 145021259. The reversal of 145021251 is 152120541.

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

It is not a de Polignac number, because 145021251 - 2¹⁵ = 144988483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145021259) 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, 24170206 + ... + 24170211.

It is an arithmetic number, because the mean of its divisors is an integer number (48340418).

Almost surely, 2^145021251 is an apocalyptic number.

145021251 is a deficient number, since it is larger than the sum of its proper divisors (48340421).

145021251 is an equidigital number, since it uses as much as digits as its factorization.

145021251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48340420.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 145021251 is about 12042.4769462100. The cubic root of 145021251 is about 525.3844512820.

Adding to 145021251 its reverse (152120541), we get a palindrome (297141792).

It can be divided in two parts, 14502 and 1251, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 145021251 in words is "one hundred forty-five million, twenty-one thousand, two hundred fifty-one".