23001551 has 2 divisors, whose sum is σ = 23001552. Its totient is φ = 23001550.

The previous prime is 23001509. The next prime is 23001613. The reversal of 23001551 is 15510032.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23001551 - 2¹⁸ = 22739407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23001851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11500775 + 11500776.

It is an arithmetic number, because the mean of its divisors is an integer number (11500776).

Almost surely, 2^23001551 is an apocalyptic number.

23001551 is a deficient number, since it is larger than the sum of its proper divisors (1).

23001551 is an equidigital number, since it uses as much as digits as its factorization.

23001551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 23001551 is about 4795.9932235148. The cubic root of 23001551 is about 284.3930903599.

Adding to 23001551 its reverse (15510032), we get a palindrome (38511583).

The spelling of 23001551 in words is "twenty-three million, one thousand, five hundred fifty-one".