1127661397 has 4 divisors (see below), whose sum is σ = 1127730816. Its totient is φ = 1127591980.

The previous prime is 1127661383. The next prime is 1127661401. The reversal of 1127661397 is 7931667211.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1127661397 - 2²³ = 1119272789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1127661307) 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, 4188 + ... + 47674.

It is an arithmetic number, because the mean of its divisors is an integer number (281932704).

Almost surely, 2^1127661397 is an apocalyptic number.

It is an amenable number.

1127661397 is a deficient number, since it is larger than the sum of its proper divisors (69419).

1127661397 is an equidigital number, since it uses as much as digits as its factorization.

1127661397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69418.

The product of its digits is 95256, while the sum is 43.

The square root of 1127661397 is about 33580.6699903382. The cubic root of 1127661397 is about 1040.8614032521.

The spelling of 1127661397 in words is "one billion, one hundred twenty-seven million, six hundred sixty-one thousand, three hundred ninety-seven".