123634261 has 4 divisors (see below), whose sum is σ = 125023500. Its totient is φ = 122245024.

The previous prime is 123634249. The next prime is 123634267. The reversal of 123634261 is 162436321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162436321 = 6337 ⋅25633.

It can be written as a sum of positive squares in 2 ways, for example, as 49140100 + 74494161 = 7010^2 + 8631^2 .

It is a cyclic number.

It is not a de Polignac number, because 123634261 - 2¹⁷ = 123503189 is a prime.

It is a super-2 number, since 2×123634261² = 30570860986032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123634267) 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, 694486 + ... + 694663.

It is an arithmetic number, because the mean of its divisors is an integer number (31255875).

Almost surely, 2^123634261 is an apocalyptic number.

It is an amenable number.

123634261 is a deficient number, since it is larger than the sum of its proper divisors (1389239).

123634261 is an equidigital number, since it uses as much as digits as its factorization.

123634261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389238.

The product of its digits is 5184, while the sum is 28.

The square root of 123634261 is about 11119.0944325516. The cubic root of 123634261 is about 498.1723421401.

The spelling of 123634261 in words is "one hundred twenty-three million, six hundred thirty-four thousand, two hundred sixty-one".