1147220901 has 20 divisors (see below), whose sum is σ = 1730400672. Its totient is φ = 757383048.

The previous prime is 1147220891. The next prime is 1147220903. The reversal of 1147220901 is 1090227411.

It is not a de Polignac number, because 1147220901 - 2²⁶ = 1080112037 is a prime.

It is a super-2 number, since 2×1147220901² = 2632231591382503602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147220903) 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 19 ways as a sum of consecutive naturals, for example, 60411 + ... + 77096.

Almost surely, 2^1147220901 is an apocalyptic number.

It is an amenable number.

1147220901 is a deficient number, since it is larger than the sum of its proper divisors (583179771).

1147220901 is a wasteful number, since it uses less digits than its factorization.

1147220901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137622 (or 137613 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1147220901 is about 33870.6495509017. The cubic root of 1147220901 is about 1046.8449208329.

The spelling of 1147220901 in words is "one billion, one hundred forty-seven million, two hundred twenty thousand, nine hundred one".