123201557 has 4 divisors (see below), whose sum is σ = 124171776. Its totient is φ = 122231340.

The previous prime is 123201553. The next prime is 123201563. The reversal of 123201557 is 755102321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755102321 = 547 ⋅1380443.

It is a cyclic number.

It is not a de Polignac number, because 123201557 - 2² = 123201553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123201553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484919 + ... + 485172.

It is an arithmetic number, because the mean of its divisors is an integer number (31042944).

Almost surely, 2^123201557 is an apocalyptic number.

It is an amenable number.

123201557 is a deficient number, since it is larger than the sum of its proper divisors (970219).

123201557 is an equidigital number, since it uses as much as digits as its factorization.

123201557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970218.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 123201557 is about 11099.6196781692. The cubic root of 123201557 is about 497.5904831088.

Adding to 123201557 its reverse (755102321), we get a palindrome (878303878).

The spelling of 123201557 in words is "one hundred twenty-three million, two hundred one thousand, five hundred fifty-seven".