1117051261 has 4 divisors (see below), whose sum is σ = 1155570300. Its totient is φ = 1078532224.

The previous prime is 1117051259. The next prime is 1117051339. The reversal of 1117051261 is 1621507111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793267225 + 323784036 = 28165^2 + 17994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1117051261 - 2¹ = 1117051259 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 (1117051561) 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, 19259476 + ... + 19259533.

It is an arithmetic number, because the mean of its divisors is an integer number (288892575).

Almost surely, 2^1117051261 is an apocalyptic number.

It is an amenable number.

1117051261 is a deficient number, since it is larger than the sum of its proper divisors (38519039).

1117051261 is an equidigital number, since it uses as much as digits as its factorization.

1117051261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38519038.

The product of its (nonzero) digits is 420, while the sum is 25.

The square root of 1117051261 is about 33422.3168107778. The cubic root of 1117051261 is about 1037.5866318718.

Adding to 1117051261 its reverse (1621507111), we get a palindrome (2738558372).

The spelling of 1117051261 in words is "one billion, one hundred seventeen million, fifty-one thousand, two hundred sixty-one".