145023247 has 4 divisors (see below), whose sum is σ = 148108896. Its totient is φ = 141937600.

The previous prime is 145023227. The next prime is 145023253. The reversal of 145023247 is 742320541.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145023247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145023227) 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, 1542754 + ... + 1542847.

It is an arithmetic number, because the mean of its divisors is an integer number (37027224).

Almost surely, 2^145023247 is an apocalyptic number.

145023247 is a deficient number, since it is larger than the sum of its proper divisors (3085649).

145023247 is an equidigital number, since it uses as much as digits as its factorization.

145023247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085648.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 145023247 is about 12042.5598192411. The cubic root of 145023247 is about 525.3868616472.

Adding to 145023247 its reverse (742320541), we get a palindrome (887343788).

The spelling of 145023247 in words is "one hundred forty-five million, twenty-three thousand, two hundred forty-seven".