1121656251 has 4 divisors (see below), whose sum is σ = 1495541672. Its totient is φ = 747770832.

The previous prime is 1121656219. The next prime is 1121656267. The reversal of 1121656251 is 1526561211.

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

It is not a de Polignac number, because 1121656251 - 2⁵ = 1121656219 is a prime.

It is a super-2 number, since 2×1121656251² = 2516225490814750002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121656271) 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, 186942706 + ... + 186942711.

It is an arithmetic number, because the mean of its divisors is an integer number (373885418).

Almost surely, 2^1121656251 is an apocalyptic number.

1121656251 is a deficient number, since it is larger than the sum of its proper divisors (373885421).

1121656251 is an equidigital number, since it uses as much as digits as its factorization.

1121656251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373885420.

The product of its digits is 3600, while the sum is 30.

The square root of 1121656251 is about 33491.1369021716. The cubic root of 1121656251 is about 1039.0104773808.

The spelling of 1121656251 in words is "one billion, one hundred twenty-one million, six hundred fifty-six thousand, two hundred fifty-one".