641121137 has 4 divisors (see below), whose sum is σ = 661802496. Its totient is φ = 620439780.

The previous prime is 641121127. The next prime is 641121181. The reversal of 641121137 is 731121146.

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 641121137 - 2⁶ = 641121073 is a prime.

It is a super-2 number, since 2×641121137² = 822072624616345538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641121127) 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, 10340633 + ... + 10340694.

It is an arithmetic number, because the mean of its divisors is an integer number (165450624).

Almost surely, 2^641121137 is an apocalyptic number.

It is an amenable number.

641121137 is a deficient number, since it is larger than the sum of its proper divisors (20681359).

641121137 is a wasteful number, since it uses less digits than its factorization.

641121137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20681358.

The product of its digits is 1008, while the sum is 26.

The square root of 641121137 is about 25320.3700012460. The cubic root of 641121137 is about 862.2767942196.

Subtracting 641121137 from its reverse (731121146), we obtain a palindrome (90000009).

The spelling of 641121137 in words is "six hundred forty-one million, one hundred twenty-one thousand, one hundred thirty-seven".