900609961 has 2 divisors, whose sum is σ = 900609962. Its totient is φ = 900609960.

The previous prime is 900609949. The next prime is 900609991. The reversal of 900609961 is 169906009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 900000000 + 609961 = 30000^2 + 781^2 .

It is a cyclic number.

It is not a de Polignac number, because 900609961 - 2⁹ = 900609449 is a prime.

It is a super-2 number, since 2×900609961² = 1622196603704843042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (900609991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450304980 + 450304981.

It is an arithmetic number, because the mean of its divisors is an integer number (450304981).

Almost surely, 2^900609961 is an apocalyptic number.

It is an amenable number.

900609961 is a deficient number, since it is larger than the sum of its proper divisors (1).

900609961 is an equidigital number, since it uses as much as digits as its factorization.

900609961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 900609961 is about 30010.1642947852. The cubic root of 900609961 is about 965.7074504867.

It can be divided in two parts, 900 and 609961, that multiplied together give a square (548964900 = 23430²).

The spelling of 900609961 in words is "nine hundred million, six hundred nine thousand, nine hundred sixty-one".