23031661 has 2 divisors, whose sum is σ = 23031662. Its totient is φ = 23031660.

The previous prime is 23031641. The next prime is 23031677. The reversal of 23031661 is 16613032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21799561 + 1232100 = 4669^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 23031661 - 2¹⁵ = 22998893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23031601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11515830 + 11515831.

It is an arithmetic number, because the mean of its divisors is an integer number (11515831).

Almost surely, 2^23031661 is an apocalyptic number.

It is an amenable number.

23031661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23031661 is an equidigital number, since it uses as much as digits as its factorization.

23031661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 23031661 is about 4799.1312755539. The cubic root of 23031661 is about 284.5171304328.

Adding to 23031661 its reverse (16613032), we get a palindrome (39644693).

It can be divided in two parts, 2303 and 1661, that multiplied together give a palindrome (3825283).

The spelling of 23031661 in words is "twenty-three million, thirty-one thousand, six hundred sixty-one".