331223157 has 6 divisors (see below), whose sum is σ = 478433462. Its totient is φ = 220815432.

The previous prime is 331223153. The next prime is 331223159. The reversal of 331223157 is 751322133.

It can be written as a sum of positive squares in only one way, i.e., 314033841 + 17189316 = 17721^2 + 4146^2 .

It is not a de Polignac number, because 331223157 - 2² = 331223153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331223157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331223153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18401278 + ... + 18401295.

Almost surely, 2^331223157 is an apocalyptic number.

It is an amenable number.

331223157 is a deficient number, since it is larger than the sum of its proper divisors (147210305).

331223157 is a wasteful number, since it uses less digits than its factorization.

331223157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36802579 (or 36802576 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 331223157 is about 18199.5372743375. The cubic root of 331223157 is about 691.8950614649.

The spelling of 331223157 in words is "three hundred thirty-one million, two hundred twenty-three thousand, one hundred fifty-seven".