147220981 has 4 divisors (see below), whose sum is σ = 147258432. Its totient is φ = 147183532.

The previous prime is 147220963. The next prime is 147220991. The reversal of 147220981 is 189022741.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 147220981 - 2¹¹ = 147218933 is a prime.

It is a super-2 number, since 2×147220981² = 43348034493204722, 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 (147220921) 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, 12031 + ... + 20956.

It is an arithmetic number, because the mean of its divisors is an integer number (36814608).

Almost surely, 2^147220981 is an apocalyptic number.

It is an amenable number.

147220981 is a deficient number, since it is larger than the sum of its proper divisors (37451).

147220981 is an equidigital number, since it uses as much as digits as its factorization.

147220981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37450.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 147220981 is about 12133.4653335311. The cubic root of 147220981 is about 528.0275336212.

The spelling of 147220981 in words is "one hundred forty-seven million, two hundred twenty thousand, nine hundred eighty-one".