1991737036 has 6 divisors (see below), whose sum is σ = 3485539820. Its totient is φ = 995868516.

The previous prime is 1991737009. The next prime is 1991737039. The reversal of 1991737036 is 6307371991.

It is not an unprimeable number, because it can be changed into a prime (1991737039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248967126 + ... + 248967133.

Almost surely, 2^1991737036 is an apocalyptic number.

It is an amenable number.

1991737036 is a deficient number, since it is larger than the sum of its proper divisors (1493802784).

1991737036 is a wasteful number, since it uses less digits than its factorization.

1991737036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497934263 (or 497934261 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 46.

The square root of 1991737036 is about 44628.8811869623. The cubic root of 1991737036 is about 1258.1835411517.

It can be divided in two parts, 19917 and 37036, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 1991737036 in words is "one billion, nine hundred ninety-one million, seven hundred thirty-seven thousand, thirty-six".