1989500761 has 4 divisors (see below), whose sum is σ = 1994922112. Its totient is φ = 1984079412.

The previous prime is 1989500753. The next prime is 1989500771. The reversal of 1989500761 is 1670059891.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1989500761 - 2³ = 1989500753 is a prime.

It is a super-2 number, since 2×1989500761² = 7916226556039158242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989500771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2710125 + ... + 2710858.

It is an arithmetic number, because the mean of its divisors is an integer number (498730528).

Almost surely, 2^1989500761 is an apocalyptic number.

It is an amenable number.

1989500761 is a deficient number, since it is larger than the sum of its proper divisors (5421351).

1989500761 is an equidigital number, since it uses as much as digits as its factorization.

1989500761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5421350.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 1989500761 is about 44603.8200269887. The cubic root of 1989500761 is about 1257.7124786175.

The spelling of 1989500761 in words is "one billion, nine hundred eighty-nine million, five hundred thousand, seven hundred sixty-one".