1261697227 has 6 divisors (see below), whose sum is σ = 1467688668. Its totient is φ = 1081454724.

The previous prime is 1261697219. The next prime is 1261697233. The reversal of 1261697227 is 7227961621.

It is not a de Polignac number, because 1261697227 - 2³ = 1261697219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261697207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12874413 + ... + 12874510.

It is an arithmetic number, because the mean of its divisors is an integer number (244614778).

Almost surely, 2^1261697227 is an apocalyptic number.

1261697227 is a deficient number, since it is larger than the sum of its proper divisors (205991441).

1261697227 is an equidigital number, since it uses as much as digits as its factorization.

1261697227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25748937 (or 25748930 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 1261697227 is about 35520.3776303124. The cubic root of 1261697227 is about 1080.5670396227.

The spelling of 1261697227 in words is "one billion, two hundred sixty-one million, six hundred ninety-seven thousand, two hundred twenty-seven".