1211740755 has 32 divisors (see below), whose sum is σ = 1956787200. Its totient is φ = 640292352.

The previous prime is 1211740687. The next prime is 1211740757. The reversal of 1211740755 is 5570471121.

It is not a de Polignac number, because 1211740755 - 2¹⁰ = 1211739731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211740757) 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, 813051 + ... + 814539.

It is an arithmetic number, because the mean of its divisors is an integer number (61149600).

Almost surely, 2^1211740755 is an apocalyptic number.

1211740755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211740755 is a deficient number, since it is larger than the sum of its proper divisors (745046445).

1211740755 is a wasteful number, since it uses less digits than its factorization.

1211740755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963.

The product of its (nonzero) digits is 9800, while the sum is 33.

The square root of 1211740755 is about 34810.0668629062. The cubic root of 1211740755 is about 1066.1129980877.

The spelling of 1211740755 in words is "one billion, two hundred eleven million, seven hundred forty thousand, seven hundred fifty-five".