145972331 has 4 divisors (see below), whose sum is σ = 146004792. Its totient is φ = 145939872.

The previous prime is 145972261. The next prime is 145972367. The reversal of 145972331 is 133279541.

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

It is a cyclic number.

It is not a de Polignac number, because 145972331 - 2¹⁰ = 145971307 is a prime.

It is a super-2 number, since 2×145972331² = 42615842835147122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145972291 and 145972300.

It is not an unprimeable number, because it can be changed into a prime (145972381) 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, 8141 + ... + 18926.

It is an arithmetic number, because the mean of its divisors is an integer number (36501198).

Almost surely, 2^145972331 is an apocalyptic number.

145972331 is a deficient number, since it is larger than the sum of its proper divisors (32461).

145972331 is an equidigital number, since it uses as much as digits as its factorization.

145972331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32460.

The product of its digits is 22680, while the sum is 35.

The square root of 145972331 is about 12081.9009679769. The cubic root of 145972331 is about 526.5304770348.

The spelling of 145972331 in words is "one hundred forty-five million, nine hundred seventy-two thousand, three hundred thirty-one".