1990236651 has 32 divisors (see below), whose sum is σ = 2909813760. Its totient is φ = 1202632704.

The previous prime is 1990236649. The next prime is 1990236671. The reversal of 1990236651 is 1566320991.

It is not a de Polignac number, because 1990236651 - 2¹ = 1990236649 is a prime.

It is a super-2 number, since 2×1990236651² = 7922083853967391602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990236671) 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 31 ways as a sum of consecutive naturals, for example, 592960 + ... + 596306.

It is an arithmetic number, because the mean of its divisors is an integer number (90931680).

Almost surely, 2^1990236651 is an apocalyptic number.

1990236651 is a deficient number, since it is larger than the sum of its proper divisors (919577109).

1990236651 is a wasteful number, since it uses less digits than its factorization.

1990236651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 1990236651 is about 44612.0684456572. The cubic root of 1990236651 is about 1257.8675299019.

The spelling of 1990236651 in words is "one billion, nine hundred ninety million, two hundred thirty-six thousand, six hundred fifty-one".