123787621 has 2 divisors, whose sum is σ = 123787622. Its totient is φ = 123787620.

The previous prime is 123787571. The next prime is 123787639. The reversal of 123787621 is 126787321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104550625 + 19236996 = 10225^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 123787621 - 2¹⁵ = 123754853 is a prime.

It is a super-2 number, since 2×123787621² = 30646750225679282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123781621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61893810 + 61893811.

It is an arithmetic number, because the mean of its divisors is an integer number (61893811).

Almost surely, 2^123787621 is an apocalyptic number.

It is an amenable number.

123787621 is a deficient number, since it is larger than the sum of its proper divisors (1).

123787621 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 123787621 = (277831621)₉.

123787621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 123787621 is about 11125.9885403500. The cubic root of 123787621 is about 498.3782401438.

The spelling of 123787621 in words is "one hundred twenty-three million, seven hundred eighty-seven thousand, six hundred twenty-one".