1161221647 has 2 divisors, whose sum is σ = 1161221648. Its totient is φ = 1161221646.

The previous prime is 1161221623. The next prime is 1161221713. The reversal of 1161221647 is 7461221611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1161221647 - 2²⁷ = 1027003919 is a prime.

It is a super-2 number, since 2×1161221647² = 2696871426922785218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161231647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580610823 + 580610824.

It is an arithmetic number, because the mean of its divisors is an integer number (580610824).

Almost surely, 2^1161221647 is an apocalyptic number.

1161221647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161221647 is an equidigital number, since it uses as much as digits as its factorization.

1161221647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 1161221647 is about 34076.7024079502. The cubic root of 1161221647 is about 1051.0862973804.

The spelling of 1161221647 in words is "one billion, one hundred sixty-one million, two hundred twenty-one thousand, six hundred forty-seven".