1011123551 has 8 divisors (see below), whose sum is σ = 1067201520. Its totient is φ = 955331712.

The previous prime is 1011123521. The next prime is 1011123557. The reversal of 1011123551 is 1553211101.

It is a happy number.

1011123551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011123551 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 (1011123557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64250 + ... + 78423.

It is an arithmetic number, because the mean of its divisors is an integer number (133400190).

Almost surely, 2^1011123551 is an apocalyptic number.

1011123551 is a deficient number, since it is larger than the sum of its proper divisors (56077969).

1011123551 is a wasteful number, since it uses less digits than its factorization.

1011123551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143065.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1011123551 is about 31798.1689881666. The cubic root of 1011123551 is about 1003.6941865145.

Adding to 1011123551 its reverse (1553211101), we get a palindrome (2564334652).

The spelling of 1011123551 in words is "one billion, eleven million, one hundred twenty-three thousand, five hundred fifty-one".