2691550961 has 4 divisors (see below), whose sum is σ = 2936237424. Its totient is φ = 2446864500.

The previous prime is 2691550951. The next prime is 2691550973. The reversal of 2691550961 is 1690551962.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2691550961 - 2¹⁴ = 2691534577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2691550921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122343215 + ... + 122343236.

It is an arithmetic number, because the mean of its divisors is an integer number (734059356).

Almost surely, 2^2691550961 is an apocalyptic number.

It is an amenable number.

2691550961 is a deficient number, since it is larger than the sum of its proper divisors (244686463).

2691550961 is a wasteful number, since it uses less digits than its factorization.

2691550961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244686462.

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 2691550961 is about 51880.1596084669. The cubic root of 2691550961 is about 1391.0226521870.

The spelling of 2691550961 in words is "two billion, six hundred ninety-one million, five hundred fifty thousand, nine hundred sixty-one".