11990534837 has 4 divisors (see below), whose sum is σ = 12006127980. Its totient is φ = 11974941696.

The previous prime is 11990534813. The next prime is 11990534849. The reversal of 11990534837 is 73843509911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7512382276 + 4478152561 = 86674^2 + 66919^2 .

It is a cyclic number.

It is not a de Polignac number, because 11990534837 - 2¹⁶ = 11990469301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11990534807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7795418 + ... + 7796955.

It is an arithmetic number, because the mean of its divisors is an integer number (3001531995).

Almost surely, 2^11990534837 is an apocalyptic number.

It is an amenable number.

11990534837 is a deficient number, since it is larger than the sum of its proper divisors (15593143).

11990534837 is an equidigital number, since it uses as much as digits as its factorization.

11990534837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15593142.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 11990534837 in words is "eleven billion, nine hundred ninety million, five hundred thirty-four thousand, eight hundred thirty-seven".