1156206261 has 32 divisors (see below), whose sum is σ = 1896092928. Its totient is φ = 611619840.

The previous prime is 1156206241. The next prime is 1156206277. The reversal of 1156206261 is 1626026511.

It is not a de Polignac number, because 1156206261 - 2⁹ = 1156205749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156206211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4770 + ... + 48323.

It is an arithmetic number, because the mean of its divisors is an integer number (59252904).

Almost surely, 2^1156206261 is an apocalyptic number.

It is an amenable number.

1156206261 is a deficient number, since it is larger than the sum of its proper divisors (739886667).

1156206261 is a wasteful number, since it uses less digits than its factorization.

1156206261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53181.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1156206261 is about 34003.0331147090. The cubic root of 1156206261 is about 1049.5708786158.

The spelling of 1156206261 in words is "one billion, one hundred fifty-six million, two hundred six thousand, two hundred sixty-one".