100387561 has 2 divisors, whose sum is σ = 100387562. Its totient is φ = 100387560.

The previous prime is 100387537. The next prime is 100387577. The reversal of 100387561 is 165783001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99121936 + 1265625 = 9956^2 + 1125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100387561 is a prime.

It is not a weakly prime, because it can be changed into another prime (100387501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50193780 + 50193781.

It is an arithmetic number, because the mean of its divisors is an integer number (50193781).

Almost surely, 2^100387561 is an apocalyptic number.

It is an amenable number.

100387561 is a deficient number, since it is larger than the sum of its proper divisors (1).

100387561 is an equidigital number, since it uses as much as digits as its factorization.

100387561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 100387561 is about 10019.3593108542. The cubic root of 100387561 is about 464.7577433137.

The spelling of 100387561 in words is "one hundred million, three hundred eighty-seven thousand, five hundred sixty-one".