123720261 has 16 divisors (see below), whose sum is σ = 191618688. Its totient is φ = 69537600.

The previous prime is 123720217. The next prime is 123720263. The reversal of 123720261 is 162027321.

It is not a de Polignac number, because 123720261 - 2¹⁰ = 123719237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123720263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47010 + ... + 49571.

It is an arithmetic number, because the mean of its divisors is an integer number (11976168).

Almost surely, 2^123720261 is an apocalyptic number.

It is an amenable number.

123720261 is a deficient number, since it is larger than the sum of its proper divisors (67898427).

123720261 is an equidigital number, since it uses as much as digits as its factorization.

123720261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96652.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 123720261 is about 11122.9609816811. The cubic root of 123720261 is about 498.2878249389.

Adding to 123720261 its reverse (162027321), we get a palindrome (285747582).

It can be divided in two parts, 12 and 3720261, that added together give a palindrome (3720273).

The spelling of 123720261 in words is "one hundred twenty-three million, seven hundred twenty thousand, two hundred sixty-one".