921869137 has 4 divisors (see below), whose sum is σ = 1053564736. Its totient is φ = 790173540.

The previous prime is 921869107. The next prime is 921869161. The reversal of 921869137 is 731968129.

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 921869137 - 2⁷ = 921869009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921869107) 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 3 ways as a sum of consecutive naturals, for example, 65847789 + ... + 65847802.

It is an arithmetic number, because the mean of its divisors is an integer number (263391184).

Almost surely, 2^921869137 is an apocalyptic number.

It is an amenable number.

921869137 is a deficient number, since it is larger than the sum of its proper divisors (131695599).

921869137 is a wasteful number, since it uses less digits than its factorization.

921869137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131695598.

The product of its digits is 163296, while the sum is 46.

The square root of 921869137 is about 30362.2979532182. The cubic root of 921869137 is about 973.2470407198.

The spelling of 921869137 in words is "nine hundred twenty-one million, eight hundred sixty-nine thousand, one hundred thirty-seven".