100406557 has 2 divisors, whose sum is σ = 100406558. Its totient is φ = 100406556.

The previous prime is 100406519. The next prime is 100406597. The reversal of 100406557 is 755604001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 33477796 = 8181^2 + 5786^2 .

It is an emirp because it is prime and its reverse (755604001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100406557 - 2¹¹ = 100404509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100406597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50203278 + 50203279.

It is an arithmetic number, because the mean of its divisors is an integer number (50203279).

Almost surely, 2^100406557 is an apocalyptic number.

It is an amenable number.

100406557 is a deficient number, since it is larger than the sum of its proper divisors (1).

100406557 is an equidigital number, since it uses as much as digits as its factorization.

100406557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 100406557 is about 10020.3072308188. The cubic root of 100406557 is about 464.7870563123.

The spelling of 100406557 in words is "one hundred million, four hundred six thousand, five hundred fifty-seven".