123521357 has 2 divisors, whose sum is σ = 123521358. Its totient is φ = 123521356.

The previous prime is 123521309. The next prime is 123521399. The reversal of 123521357 is 753125321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123520996 + 361 = 11114^2 + 19^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123521357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123521857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760678 + 61760679.

It is an arithmetic number, because the mean of its divisors is an integer number (61760679).

Almost surely, 2^123521357 is an apocalyptic number.

It is an amenable number.

123521357 is a deficient number, since it is larger than the sum of its proper divisors (1).

123521357 is an equidigital number, since it uses as much as digits as its factorization.

123521357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 29.

The square root of 123521357 is about 11114.0162407655. The cubic root of 123521357 is about 498.0206506923.

Adding to 123521357 its reverse (753125321), we get a palindrome (876646678).

The spelling of 123521357 in words is "one hundred twenty-three million, five hundred twenty-one thousand, three hundred fifty-seven".