1635000961 has 4 divisors (see below), whose sum is σ = 1783637424. Its totient is φ = 1486364500.

The previous prime is 1635000953. The next prime is 1635000973. The reversal of 1635000961 is 1690005361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1690005361 = 11 ⋅153636851.

It is a cyclic number.

It is not a de Polignac number, because 1635000961 - 2³ = 1635000953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1635000161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74318215 + ... + 74318236.

It is an arithmetic number, because the mean of its divisors is an integer number (445909356).

Almost surely, 2^1635000961 is an apocalyptic number.

1635000961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1635000961 is a deficient number, since it is larger than the sum of its proper divisors (148636463).

1635000961 is a wasteful number, since it uses less digits than its factorization.

1635000961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148636462.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1635000961 is about 40435.1451215400. The cubic root of 1635000961 is about 1178.0742699121.

The spelling of 1635000961 in words is "one billion, six hundred thirty-five million, nine hundred sixty-one", and thus it is an aban number.