981380929 has 3 divisors (see below), whose sum is σ = 981412257. Its totient is φ = 981349602.

The previous prime is 981380927. The next prime is 981380941. The reversal of 981380929 is 929083189.

The square root of 981380929 is 31327.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 981380929 - 2¹ = 981380927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981380923) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15664 + ... + 46990.

It is an arithmetic number, because the mean of its divisors is an integer number (327137419).

Almost surely, 2^981380929 is an apocalyptic number.

981380929 is the 31327-th square number.

981380929 is the 15664-th centered octagonal number.

It is an amenable number.

981380929 is a deficient number, since it is larger than the sum of its proper divisors (31328).

981380929 is an frugal number, since it uses more digits than its factorization.

981380929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62654 (or 31327 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The cubic root of 981380929 is about 993.7547206822.

Multiplying 981380929 by its sum of digits (49), we get a square (48087665521 = 219289²).

The spelling of 981380929 in words is "nine hundred eighty-one million, three hundred eighty thousand, nine hundred twenty-nine".