31401323 has 4 divisors (see below), whose sum is σ = 31494840. Its totient is φ = 31307808.

The previous prime is 31401317. The next prime is 31401353. The reversal of 31401323 is 32310413.

It is a happy number.

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 31401323 - 2⁸ = 31401067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31401313) 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, 46253 + ... + 46926.

It is an arithmetic number, because the mean of its divisors is an integer number (7873710).

Almost surely, 2^31401323 is an apocalyptic number.

31401323 is a deficient number, since it is larger than the sum of its proper divisors (93517).

31401323 is an equidigital number, since it uses as much as digits as its factorization.

31401323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93516.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31401323 is about 5603.6883389425. The cubic root of 31401323 is about 315.4878574595.

Adding to 31401323 its reverse (32310413), we get a palindrome (63711736).

The spelling of 31401323 in words is "thirty-one million, four hundred one thousand, three hundred twenty-three".