1161021949 has 2 divisors, whose sum is σ = 1161021950. Its totient is φ = 1161021948.

The previous prime is 1161021947. The next prime is 1161021971. The reversal of 1161021949 is 9491201611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1160764900 + 257049 = 34070^2 + 507^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161021949 - 2¹ = 1161021947 is a prime.

Together with 1161021947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161021941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580510974 + 580510975.

It is an arithmetic number, because the mean of its divisors is an integer number (580510975).

Almost surely, 2^1161021949 is an apocalyptic number.

It is an amenable number.

1161021949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161021949 is an equidigital number, since it uses as much as digits as its factorization.

1161021949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1161021949 is about 34073.7721568951. The cubic root of 1161021949 is about 1051.0260413373.

The spelling of 1161021949 in words is "one billion, one hundred sixty-one million, twenty-one thousand, nine hundred forty-nine".