100623661 has 2 divisors, whose sum is σ = 100623662. Its totient is φ = 100623660.

The previous prime is 100623647. The next prime is 100623673. The reversal of 100623661 is 166326001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97713225 + 2910436 = 9885^2 + 1706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100623661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100623161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50311830 + 50311831.

It is an arithmetic number, because the mean of its divisors is an integer number (50311831).

Almost surely, 2^100623661 is an apocalyptic number.

It is an amenable number.

100623661 is a deficient number, since it is larger than the sum of its proper divisors (1).

100623661 is an equidigital number, since it uses as much as digits as its factorization.

100623661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 100623661 is about 10031.1345818905. The cubic root of 100623661 is about 465.1218103049.

Adding to 100623661 its reverse (166326001), we get a palindrome (266949662).

The spelling of 100623661 in words is "one hundred million, six hundred twenty-three thousand, six hundred sixty-one".