427611721 has 4 divisors (see below), whose sum is σ = 428803200. Its totient is φ = 426420244.

The previous prime is 427611703. The next prime is 427611731. The reversal of 427611721 is 127116724.

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 427611721 - 2⁵ = 427611689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427611731) 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, 595201 + ... + 595918.

It is an arithmetic number, because the mean of its divisors is an integer number (107200800).

Almost surely, 2^427611721 is an apocalyptic number.

It is an amenable number.

427611721 is a deficient number, since it is larger than the sum of its proper divisors (1191479).

427611721 is a wasteful number, since it uses less digits than its factorization.

427611721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191478.

The product of its digits is 4704, while the sum is 31.

The square root of 427611721 is about 20678.7746493838. The cubic root of 427611721 is about 753.3842445862.

The spelling of 427611721 in words is "four hundred twenty-seven million, six hundred eleven thousand, seven hundred twenty-one".