1900001100061 has 2 divisors, whose sum is σ = 1900001100062. Its totient is φ = 1900001100060.

The previous prime is 1900001099989. The next prime is 1900001100083. The reversal of 1900001100061 is 1600011000091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1897765228836 + 2235871225 = 1377594^2 + 47285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900001100061 - 2⁷ = 1900001099933 is a prime.

It is a super-2 number, since 2×1900001100061² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1900001100091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950000550030 + 950000550031.

It is an arithmetic number, because the mean of its divisors is an integer number (950000550031).

Almost surely, 2^{1900001100061} is an apocalyptic number.

It is an amenable number.

1900001100061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900001100061 is an equidigital number, since it uses as much as digits as its factorization.

1900001100061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The spelling of 1900001100061 in words is "one trillion, nine hundred billion, one million, one hundred thousand, sixty-one".