145891751 has 4 divisors (see below), whose sum is σ = 145928592. Its totient is φ = 145854912.

The previous prime is 145891667. The next prime is 145891769. The reversal of 145891751 is 157198541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157198541 = 17 ⋅9246973.

It is a cyclic number.

It is not a de Polignac number, because 145891751 - 2²² = 141697447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145891699 and 145891708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145891771) 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, 11651 + ... + 20676.

It is an arithmetic number, because the mean of its divisors is an integer number (36482148).

Almost surely, 2^145891751 is an apocalyptic number.

145891751 is a deficient number, since it is larger than the sum of its proper divisors (36841).

145891751 is an equidigital number, since it uses as much as digits as its factorization.

145891751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36840.

The product of its digits is 50400, while the sum is 41.

The square root of 145891751 is about 12078.5657675073. The cubic root of 145891751 is about 526.4335736582.

The spelling of 145891751 in words is "one hundred forty-five million, eight hundred ninety-one thousand, seven hundred fifty-one".