1011019720 has 16 divisors (see below), whose sum is σ = 2274794460. Its totient is φ = 404407872.

The previous prime is 1011019703. The next prime is 1011019739. The reversal of 1011019720 is 279101101.

It can be written as a sum of positive squares in 2 ways, for example, as 954439236 + 56580484 = 30894^2 + 7522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1011019691 and 1011019700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12637707 + ... + 12637786.

Almost surely, 2^1011019720 is an apocalyptic number.

1011019720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011019720 is an abundant number, since it is smaller than the sum of its proper divisors (1263774740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011019720 is a wasteful number, since it uses less digits than its factorization.

1011019720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25275504 (or 25275500 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 1011019720 is about 31796.5362893508. The cubic root of 1011019720 is about 1003.6598293091.

The spelling of 1011019720 in words is "one billion, eleven million, nineteen thousand, seven hundred twenty".