981221457 has 16 divisors (see below), whose sum is σ = 1317461760. Its totient is φ = 649577472.

The previous prime is 981221413. The next prime is 981221477. The reversal of 981221457 is 754122189.

It is not a de Polignac number, because 981221457 - 2⁸ = 981221201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981221477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415123 + ... + 417479.

It is an arithmetic number, because the mean of its divisors is an integer number (82341360).

Almost surely, 2^981221457 is an apocalyptic number.

It is an amenable number.

981221457 is a deficient number, since it is larger than the sum of its proper divisors (336240303).

981221457 is a wasteful number, since it uses less digits than its factorization.

981221457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272.

The product of its digits is 40320, while the sum is 39.

The square root of 981221457 is about 31324.4546161621. The cubic root of 981221457 is about 993.7008901960.

The spelling of 981221457 in words is "nine hundred eighty-one million, two hundred twenty-one thousand, four hundred fifty-seven".