123857641 has 2 divisors, whose sum is σ = 123857642. Its totient is φ = 123857640.

The previous prime is 123857623. The next prime is 123857647. The reversal of 123857641 is 146758321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96609241 + 27248400 = 9829^2 + 5220^2 .

It is a cyclic number.

It is not a de Polignac number, because 123857641 - 2¹³ = 123849449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123857641.

It is not a weakly prime, because it can be changed into another prime (123857647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61928820 + 61928821.

It is an arithmetic number, because the mean of its divisors is an integer number (61928821).

Almost surely, 2^123857641 is an apocalyptic number.

It is an amenable number.

123857641 is a deficient number, since it is larger than the sum of its proper divisors (1).

123857641 is an equidigital number, since it uses as much as digits as its factorization.

123857641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 123857641 is about 11129.1347821832. The cubic root of 123857641 is about 498.4721910211.

The spelling of 123857641 in words is "one hundred twenty-three million, eight hundred fifty-seven thousand, six hundred forty-one".