1011939721 has 9 divisors (see below), whose sum is σ = 1096217031. Its totient is φ = 933716472.

The previous prime is 1011939713. The next prime is 1011939811. The reversal of 1011939721 is 1279391101.

The square root of 1011939721 is 31811.

It is a perfect power (a square), and thus also a powerful number.

1011939721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149695225 + 862244496 = 12235^2 + 29364^2 .

It is not a de Polignac number, because 1011939721 - 2³ = 1011939713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011939121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 412320 + ... + 414766.

Almost surely, 2^1011939721 is an apocalyptic number.

1011939721 is the 31811-st square number.

1011939721 is the 15906-th centered octagonal number.

It is an amenable number.

1011939721 is a deficient number, since it is larger than the sum of its proper divisors (84277310).

1011939721 is an frugal number, since it uses more digits than its factorization.

1011939721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920 (or 2460 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 34.

The cubic root of 1011939721 is about 1003.9641715785.

The spelling of 1011939721 in words is "one billion, eleven million, nine hundred thirty-nine thousand, seven hundred twenty-one".