123351409 has 2 divisors, whose sum is σ = 123351410. Its totient is φ = 123351408.

The previous prime is 123351407. The next prime is 123351457. The reversal of 123351409 is 904153321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89245809 + 34105600 = 9447^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 123351409 - 2¹ = 123351407 is a prime.

Together with 123351407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123351407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61675704 + 61675705.

It is an arithmetic number, because the mean of its divisors is an integer number (61675705).

Almost surely, 2^123351409 is an apocalyptic number.

It is an amenable number.

123351409 is a deficient number, since it is larger than the sum of its proper divisors (1).

123351409 is an equidigital number, since it uses as much as digits as its factorization.

123351409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 123351409 is about 11106.3679481638. The cubic root of 123351409 is about 497.7921437583.

The spelling of 123351409 in words is "one hundred twenty-three million, three hundred fifty-one thousand, four hundred nine".