7721315 has 32 divisors (see below), whose sum is σ = 11819520. Its totient is φ = 4713984.

The previous prime is 7721303. The next prime is 7721339. The reversal of 7721315 is 5131277.

7721315 = 48² + 49² + ... + 285².

It is a cyclic number.

It is not a de Polignac number, because 7721315 - 2⁶ = 7721251 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10964 + ... + 11646.

It is an arithmetic number, because the mean of its divisors is an integer number (369360).

Almost surely, 2^7721315 is an apocalyptic number.

7721315 is a deficient number, since it is larger than the sum of its proper divisors (4098205).

7721315 is a wasteful number, since it uses less digits than its factorization.

7721315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its digits is 1470, while the sum is 26.

The square root of 7721315 is about 2778.7254272418. The cubic root of 7721315 is about 197.6501235349.

It can be divided in two parts, 7721 and 315, that multiplied together give a triangular number (2432115 = T₂₂₀₅).

The spelling of 7721315 in words is "seven million, seven hundred twenty-one thousand, three hundred fifteen".