1121178251 has 24 divisors (see below), whose sum is σ = 1205410800. Its totient is φ = 1041465600.

The previous prime is 1121178241. The next prime is 1121178257. The reversal of 1121178251 is 1528711211.

It is a de Polignac number, because none of the positive numbers 2^k-1121178251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121178257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5313536 + ... + 5313746.

It is an arithmetic number, because the mean of its divisors is an integer number (50225450).

Almost surely, 2^1121178251 is an apocalyptic number.

1121178251 is the 14975-th centered decagonal number.

1121178251 is a deficient number, since it is larger than the sum of its proper divisors (84232549).

1121178251 is a wasteful number, since it uses less digits than its factorization.

1121178251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 390 counting only the distinct ones).

The product of its digits is 1120, while the sum is 29.

The square root of 1121178251 is about 33483.9999253375. Note that the first 4 decimals coincide. The cubic root of 1121178251 is about 1038.8628630607.

Adding to 1121178251 its reverse (1528711211), we get a palindrome (2649889462).

The spelling of 1121178251 in words is "one billion, one hundred twenty-one million, one hundred seventy-eight thousand, two hundred fifty-one".