1930811481 has 27 divisors (see below), whose sum is σ = 2836784223. Its totient is φ = 1265500800.

The previous prime is 1930811473. The next prime is 1930811537. The reversal of 1930811481 is 1841180391.

The square root of 1930811481 is 43941.

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

It can be written as a sum of positive squares in only one way, i.e., 867008025 + 1063803456 = 29445^2 + 32616^2 .

It is not a de Polignac number, because 1930811481 - 2³ = 1930811473 is a prime.

It is a super-2 number, since 2×1930811481² = 7456065950322826722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1930811411) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12786756 + ... + 12786906.

Almost surely, 2^1930811481 is an apocalyptic number.

1930811481 is the 43941-st square number.

1930811481 is the 21971-st centered octagonal number.

It is an amenable number.

1930811481 is a deficient number, since it is larger than the sum of its proper divisors (905972742).

1930811481 is an frugal number, since it uses more digits than its factorization.

1930811481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The cubic root of 1930811481 is about 1245.2215389380.

Multiplying 1930811481 by its sum of digits (36), we get a square (69509213316 = 263646²).

The spelling of 1930811481 in words is "one billion, nine hundred thirty million, eight hundred eleven thousand, four hundred eighty-one".