1121212554 has 128 divisors (see below), whose sum is σ = 2902874112. Its totient is φ = 280247040.

The previous prime is 1121212541. The next prime is 1121212567. The reversal of 1121212554 is 4552121211.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1121212541) and next prime (1121212567).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1828752 + ... + 1829364.

It is an arithmetic number, because the mean of its divisors is an integer number (22678704).

Almost surely, 2^1121212554 is an apocalyptic number.

1121212554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121212554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451437056).

1121212554 is an abundant number, since it is smaller than the sum of its proper divisors (1781661558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121212554 is a wasteful number, since it uses less digits than its factorization.

1121212554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780.

The product of its digits is 800, while the sum is 24.

The square root of 1121212554 is about 33484.5121511424. The cubic root of 1121212554 is about 1038.8734577928.

Adding to 1121212554 its reverse (4552121211), we get a palindrome (5673333765).

The spelling of 1121212554 in words is "one billion, one hundred twenty-one million, two hundred twelve thousand, five hundred fifty-four".