2654999981 has 4 divisors (see below), whose sum is σ = 2656475964. Its totient is φ = 2653524000.

The previous prime is 2654999957. The next prime is 2654999987. The reversal of 2654999981 is 1899994562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1286369956 + 1368630025 = 35866^2 + 36995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2654999981 - 2³⁰ = 1581258157 is a prime.

It is a super-2 number, since 2×2654999981² = 14098049798220000722, 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 (2654999987) 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, 735290 + ... + 738891.

It is an arithmetic number, because the mean of its divisors is an integer number (664118991).

Almost surely, 2^2654999981 is an apocalyptic number.

It is an amenable number.

2654999981 is a deficient number, since it is larger than the sum of its proper divisors (1475983).

2654999981 is a wasteful number, since it uses less digits than its factorization.

2654999981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475982.

The product of its digits is 12597120, while the sum is 62.

The square root of 2654999981 is about 51526.6919275825. The cubic root of 2654999981 is about 1384.6972852992.

The spelling of 2654999981 in words is "two billion, six hundred fifty-four million, nine hundred ninety-nine thousand, nine hundred eighty-one".