7721901 has 12 divisors (see below), whose sum is σ = 12168000. Its totient is φ = 4679880.

The previous prime is 7721891. The next prime is 7721911. The reversal of 7721901 is 1091277.

It is an interprime number because it is at equal distance from previous prime (7721891) and next prime (7721911).

It is not a de Polignac number, because 7721901 - 2⁶ = 7721837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38901 + ... + 39098.

It is an arithmetic number, because the mean of its divisors is an integer number (1014000).

Almost surely, 2^7721901 is an apocalyptic number.

It is an amenable number.

7721901 is a deficient number, since it is larger than the sum of its proper divisors (4446099).

7721901 is a wasteful number, since it uses less digits than its factorization.

7721901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78016 (or 78013 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 7721901 is about 2778.8308692686. The cubic root of 7721901 is about 197.6551235486.

The spelling of 7721901 in words is "seven million, seven hundred twenty-one thousand, nine hundred one".