6490420981 has 4 divisors (see below), whose sum is σ = 7080459264. Its totient is φ = 5900382700.

The previous prime is 6490420949. The next prime is 6490420997. The reversal of 6490420981 is 1890240946.

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 6490420981 - 2⁵ = 6490420949 is a prime.

It is a super-2 number, since 2×6490420981² = 84251129021210004722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6490420921) 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, 295019125 + ... + 295019146.

It is an arithmetic number, because the mean of its divisors is an integer number (1770114816).

Almost surely, 2^6490420981 is an apocalyptic number.

It is an amenable number.

6490420981 is a deficient number, since it is larger than the sum of its proper divisors (590038283).

6490420981 is a wasteful number, since it uses less digits than its factorization.

6490420981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590038282.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 6490420981 is about 80563.1490260901. The cubic root of 6490420981 is about 1865.3383637142.

The spelling of 6490420981 in words is "six billion, four hundred ninety million, four hundred twenty thousand, nine hundred eighty-one".