23531407 has 2 divisors, whose sum is σ = 23531408. Its totient is φ = 23531406.

The previous prime is 23531401. The next prime is 23531419. The reversal of 23531407 is 70413532.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23531407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23531401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765703 + 11765704.

It is an arithmetic number, because the mean of its divisors is an integer number (11765704).

Almost surely, 2^23531407 is an apocalyptic number.

23531407 is a deficient number, since it is larger than the sum of its proper divisors (1).

23531407 is an equidigital number, since it uses as much as digits as its factorization.

23531407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 23531407 is about 4850.9181605135. The cubic root of 23531407 is about 286.5602617234.

Adding to 23531407 its reverse (70413532), we get a palindrome (93944939).

The spelling of 23531407 in words is "twenty-three million, five hundred thirty-one thousand, four hundred seven".