2440691561 has 16 divisors (see below), whose sum is σ = 3046179840. Its totient is φ = 1899812880.

The previous prime is 2440691551. The next prime is 2440691587. The reversal of 2440691561 is 1651960442.

It is not a de Polignac number, because 2440691561 - 2²² = 2436497257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2440691521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58070 + ... + 90848.

It is an arithmetic number, because the mean of its divisors is an integer number (190386240).

Almost surely, 2^2440691561 is an apocalyptic number.

It is an amenable number.

2440691561 is a deficient number, since it is larger than the sum of its proper divisors (605488279).

2440691561 is a wasteful number, since it uses less digits than its factorization.

2440691561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33764.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2440691561 is about 49403.3557665874. The cubic root of 2440691561 is about 1346.3902763807.

The spelling of 2440691561 in words is "two billion, four hundred forty million, six hundred ninety-one thousand, five hundred sixty-one".