100785457 has 2 divisors, whose sum is σ = 100785458. Its totient is φ = 100785456.

The previous prime is 100785449. The next prime is 100785463. The reversal of 100785457 is 754587001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76667536 + 24117921 = 8756^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 100785457 - 2³ = 100785449 is a prime.

It is not a weakly prime, because it can be changed into another prime (100785857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50392728 + 50392729.

It is an arithmetic number, because the mean of its divisors is an integer number (50392729).

Almost surely, 2^100785457 is an apocalyptic number.

It is an amenable number.

100785457 is a deficient number, since it is larger than the sum of its proper divisors (1).

100785457 is an equidigital number, since it uses as much as digits as its factorization.

100785457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 100785457 is about 10039.1960335477. The cubic root of 100785457 is about 465.3709715485.

The spelling of 100785457 in words is "one hundred million, seven hundred eighty-five thousand, four hundred fifty-seven".