2154838961 has 16 divisors (see below), whose sum is σ = 2493021888. Its totient is φ = 1840742400.

The previous prime is 2154838957. The next prime is 2154838979. The reversal of 2154838961 is 1698384512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2154838961 - 2² = 2154838957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154838901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111281 + ... + 129201.

It is an arithmetic number, because the mean of its divisors is an integer number (155813868).

Almost surely, 2^2154838961 is an apocalyptic number.

It is an amenable number.

2154838961 is a deficient number, since it is larger than the sum of its proper divisors (338182927).

2154838961 is a wasteful number, since it uses less digits than its factorization.

2154838961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18592.

The product of its digits is 414720, while the sum is 47.

The square root of 2154838961 is about 46420.2430088426. The cubic root of 2154838961 is about 1291.6304446552.

The spelling of 2154838961 in words is "two billion, one hundred fifty-four million, eight hundred thirty-eight thousand, nine hundred sixty-one".