1147219861 has 2 divisors, whose sum is σ = 1147219862. Its totient is φ = 1147219860.

The previous prime is 1147219841. The next prime is 1147219889. The reversal of 1147219861 is 1689127411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 912946225 + 234273636 = 30215^2 + 15306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1147219861 - 2²⁵ = 1113665429 is a prime.

It is a super-2 number, since 2×1147219861² = 2632226818945718642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1147219831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 573609930 + 573609931.

It is an arithmetic number, because the mean of its divisors is an integer number (573609931).

Almost surely, 2^1147219861 is an apocalyptic number.

It is an amenable number.

1147219861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1147219861 is an equidigital number, since it uses as much as digits as its factorization.

1147219861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 1147219861 is about 33870.6341983731. The cubic root of 1147219861 is about 1046.8446044978.

The spelling of 1147219861 in words is "one billion, one hundred forty-seven million, two hundred nineteen thousand, eight hundred sixty-one".