1147459721 has 4 divisors (see below), whose sum is σ = 1155058944. Its totient is φ = 1139860500.

The previous prime is 1147459717. The next prime is 1147459751. The reversal of 1147459721 is 1279547411.

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 an emirpimes, since its reverse is a distinct semiprime: 1279547411 = 47 ⋅27224413.

It is a cyclic number.

It is not a de Polignac number, because 1147459721 - 2² = 1147459717 is a prime.

It is a super-2 number, since 2×1147459721² = 2633327622634795682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1147459751) 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, 3799385 + ... + 3799686.

It is an arithmetic number, because the mean of its divisors is an integer number (288764736).

Almost surely, 2^1147459721 is an apocalyptic number.

It is an amenable number.

1147459721 is a deficient number, since it is larger than the sum of its proper divisors (7599223).

1147459721 is an equidigital number, since it uses as much as digits as its factorization.

1147459721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7599222.

The product of its digits is 70560, while the sum is 41.

The square root of 1147459721 is about 33874.1748386584. The cubic root of 1147459721 is about 1046.9175572821.

The spelling of 1147459721 in words is "one billion, one hundred forty-seven million, four hundred fifty-nine thousand, seven hundred twenty-one".