1011561155 has 16 divisors (see below), whose sum is σ = 1366944768. Its totient is φ = 711948000.

The previous prime is 1011561107. The next prime is 1011561163. The reversal of 1011561155 is 5511651101.

1011561155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1011561155 - 2⁸ = 1011560899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294941 + ... + 298350.

It is an arithmetic number, because the mean of its divisors is an integer number (85434048).

Almost surely, 2^1011561155 is an apocalyptic number.

1011561155 is a deficient number, since it is larger than the sum of its proper divisors (355383613).

1011561155 is a wasteful number, since it uses less digits than its factorization.

1011561155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593338.

The product of its (nonzero) digits is 750, while the sum is 26.

The square root of 1011561155 is about 31805.0492060616. The cubic root of 1011561155 is about 1003.8389618462.

The spelling of 1011561155 in words is "one billion, eleven million, five hundred sixty-one thousand, one hundred fifty-five".