2101551261 has 8 divisors (see below), whose sum is σ = 2802876480. Its totient is φ = 1400630112.

The previous prime is 2101551253. The next prime is 2101551293. The reversal of 2101551261 is 1621551012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101551261 - 2³ = 2101551253 is a prime.

It is a super-2 number, since 2×2101551261² = 8833035405221380242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101551251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88665 + ... + 109838.

It is an arithmetic number, because the mean of its divisors is an integer number (350359560).

Almost surely, 2^2101551261 is an apocalyptic number.

It is an amenable number.

2101551261 is a deficient number, since it is larger than the sum of its proper divisors (701325219).

2101551261 is a wasteful number, since it uses less digits than its factorization.

2101551261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202035.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 2101551261 is about 45842.6794701182. The cubic root of 2101551261 is about 1280.8944068246.

The spelling of 2101551261 in words is "two billion, one hundred one million, five hundred fifty-one thousand, two hundred sixty-one".