1097961161 has 4 divisors (see below), whose sum is σ = 1197775824. Its totient is φ = 998146500.

The previous prime is 1097961157. The next prime is 1097961169. The reversal of 1097961161 is 1611697901.

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 1097961161 - 2² = 1097961157 is a prime.

It is a super-2 number, since 2×1097961161² = 2411037422128935842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097961169) 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, 49907315 + ... + 49907336.

It is an arithmetic number, because the mean of its divisors is an integer number (299443956).

Almost surely, 2^1097961161 is an apocalyptic number.

1097961161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1097961161 is a deficient number, since it is larger than the sum of its proper divisors (99814663).

1097961161 is an equidigital number, since it uses as much as digits as its factorization.

1097961161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99814662.

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 1097961161 is about 33135.4969934057. The cubic root of 1097961161 is about 1031.6419473907.

The spelling of 1097961161 in words is "one billion, ninety-seven million, nine hundred sixty-one thousand, one hundred sixty-one".