145213751 has 4 divisors (see below), whose sum is σ = 152856600. Its totient is φ = 137570904.

The previous prime is 145213727. The next prime is 145213777. The reversal of 145213751 is 157312541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157312541 = 5039 ⋅31219.

It is a cyclic number.

It is not a de Polignac number, because 145213751 - 2⁶ = 145213687 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 (145213721) 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, 3821396 + ... + 3821433.

It is an arithmetic number, because the mean of its divisors is an integer number (38214150).

Almost surely, 2^145213751 is an apocalyptic number.

145213751 is a deficient number, since it is larger than the sum of its proper divisors (7642849).

145213751 is an equidigital number, since it uses as much as digits as its factorization.

145213751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7642848.

The product of its digits is 4200, while the sum is 29.

The square root of 145213751 is about 12050.4668374300. The cubic root of 145213751 is about 525.6168121484.

The spelling of 145213751 in words is "one hundred forty-five million, two hundred thirteen thousand, seven hundred fifty-one".