7461721 has 4 divisors (see below), whose sum is σ = 7468672. Its totient is φ = 7454772.

The previous prime is 7461697. The next prime is 7461757. The reversal of 7461721 is 1271647.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7461721 - 2⁵ = 7461689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7461721.

It is not an unprimeable number, because it can be changed into a prime (7461761) 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, 1485 + ... + 4138.

It is an arithmetic number, because the mean of its divisors is an integer number (1867168).

Almost surely, 2^7461721 is an apocalyptic number.

It is an amenable number.

7461721 is a deficient number, since it is larger than the sum of its proper divisors (6951).

7461721 is a wasteful number, since it uses less digits than its factorization.

7461721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6950.

The product of its digits is 2352, while the sum is 28.

The square root of 7461721 is about 2731.6150900154. The cubic root of 7461721 is about 195.4097978490.

The spelling of 7461721 in words is "seven million, four hundred sixty-one thousand, seven hundred twenty-one".