1994065731 has 36 divisors (see below), whose sum is σ = 3458679744. Its totient is φ = 1102701600.

The previous prime is 1994065727. The next prime is 1994065739. The reversal of 1994065731 is 1375604991.

1994065731 is a `hidden beast` number, since 199 + 406 + 57 + 3 + 1 = 666.

It is not a de Polignac number, because 1994065731 - 2² = 1994065727 is a prime.

It is a super-2 number, since 2×1994065731² = 7952596279097128722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1994065739) 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 in 35 ways as a sum of consecutive naturals, for example, 59260 + ... + 86601.

Almost surely, 2^1994065731 is an apocalyptic number.

1994065731 is a deficient number, since it is larger than the sum of its proper divisors (1464614013).

1994065731 is a wasteful number, since it uses less digits than its factorization.

1994065731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145912 (or 145902 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 1994065731 is about 44654.9631172169. The cubic root of 1994065731 is about 1258.6736969875.

The spelling of 1994065731 in words is "one billion, nine hundred ninety-four million, sixty-five thousand, seven hundred thirty-one".