5149321981 has 8 divisors (see below), whose sum is σ = 5452952184. Its totient is φ = 4845772800.

The previous prime is 5149321943. The next prime is 5149321999. The reversal of 5149321981 is 1891239415.

It can be written as a sum of positive squares in 4 ways, for example, as 3275730756 + 1873591225 = 57234^2 + 43285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5149321981 - 2⁹ = 5149321469 is a prime.

It is a super-2 number, since 2×5149321981² = 53031033728019528722, 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 (5149321181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153021 + ... + 183613.

It is an arithmetic number, because the mean of its divisors is an integer number (681619023).

Almost surely, 2^5149321981 is an apocalyptic number.

It is an amenable number.

5149321981 is a deficient number, since it is larger than the sum of its proper divisors (303630203).

5149321981 is a wasteful number, since it uses less digits than its factorization.

5149321981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40511.

The product of its digits is 77760, while the sum is 43.

The square root of 5149321981 is about 71758.7763343272. The cubic root of 5149321981 is about 1726.8317145482.

The spelling of 5149321981 in words is "five billion, one hundred forty-nine million, three hundred twenty-one thousand, nine hundred eighty-one".