2054530781 has 18 divisors (see below), whose sum is σ = 2248200990. Its totient is φ = 1875038256.

The previous prime is 2054530759. The next prime is 2054530799. The reversal of 2054530781 is 1870354502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1771147225 + 283383556 = 42085^2 + 16834^2 .

It is not a de Polignac number, because 2054530781 - 2⁶ = 2054530717 is a prime.

It is a super-2 number, since 2×2054530781² = 8442193460152939922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2054530481) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4637546 + ... + 4637988.

It is an arithmetic number, because the mean of its divisors is an integer number (124900055).

Almost surely, 2^2054530781 is an apocalyptic number.

It is an amenable number.

2054530781 is a deficient number, since it is larger than the sum of its proper divisors (193670209).

2054530781 is an frugal number, since it uses more digits than its factorization.

2054530781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 2054530781 is about 45326.9321816511. The cubic root of 2054530781 is about 1271.2692749748.

The spelling of 2054530781 in words is "two billion, fifty-four million, five hundred thirty thousand, seven hundred eighty-one".