123203551 has 2 divisors, whose sum is σ = 123203552. Its totient is φ = 123203550.

The previous prime is 123203527. The next prime is 123203567. The reversal of 123203551 is 155302321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123203551 - 2⁹ = 123203039 is a prime.

It is a super-2 number, since 2×123203551² = 30358229958019202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123203251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61601775 + 61601776.

It is an arithmetic number, because the mean of its divisors is an integer number (61601776).

Almost surely, 2^123203551 is an apocalyptic number.

123203551 is a deficient number, since it is larger than the sum of its proper divisors (1).

123203551 is an equidigital number, since it uses as much as digits as its factorization.

123203551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 123203551 is about 11099.7095007032. The cubic root of 123203551 is about 497.5931675719.

Adding to 123203551 its reverse (155302321), we get a palindrome (278505872).

The spelling of 123203551 in words is "one hundred twenty-three million, two hundred three thousand, five hundred fifty-one".