331145501 has 4 divisors (see below), whose sum is σ = 331291104. Its totient is φ = 330999900.

The previous prime is 331145453. The next prime is 331145531. The reversal of 331145501 is 105541133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331145501 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 (331145531) 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, 69335 + ... + 73956.

It is an arithmetic number, because the mean of its divisors is an integer number (82822776).

Almost surely, 2^331145501 is an apocalyptic number.

It is an amenable number.

331145501 is a deficient number, since it is larger than the sum of its proper divisors (145603).

331145501 is a wasteful number, since it uses less digits than its factorization.

331145501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145602.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 331145501 is about 18197.4036884386. The cubic root of 331145501 is about 691.8409851307.

Adding to 331145501 its reverse (105541133), we get a palindrome (436686634).

The spelling of 331145501 in words is "three hundred thirty-one million, one hundred forty-five thousand, five hundred one".