7721151 has 4 divisors (see below), whose sum is σ = 10294872. Its totient is φ = 5147432.

The previous prime is 7721149. The next prime is 7721167. The reversal of 7721151 is 1511277.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7721151 - 2¹ = 7721149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721101) 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, 1286856 + ... + 1286861.

It is an arithmetic number, because the mean of its divisors is an integer number (2573718).

Almost surely, 2^7721151 is an apocalyptic number.

7721151 is a deficient number, since it is larger than the sum of its proper divisors (2573721).

7721151 is a wasteful number, since it uses less digits than its factorization.

7721151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573720.

The product of its digits is 490, while the sum is 24.

The square root of 7721151 is about 2778.6959171525. The cubic root of 7721151 is about 197.6487241683.

The spelling of 7721151 in words is "seven million, seven hundred twenty-one thousand, one hundred fifty-one".