2261215551 has 16 divisors (see below), whose sum is σ = 3470817024. Its totient is φ = 1282689984.

The previous prime is 2261215549. The next prime is 2261215553. The reversal of 2261215551 is 1555121622.

It is an interprime number because it is at equal distance from previous prime (2261215549) and next prime (2261215553).

It is not a de Polignac number, because 2261215551 - 2¹ = 2261215549 is a prime.

It is a super-2 number, since 2×2261215551² = 10226191536168467202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261215553) 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, 390105 + ... + 395858.

It is an arithmetic number, because the mean of its divisors is an integer number (216926064).

Almost surely, 2^2261215551 is an apocalyptic number.

2261215551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2261215551 is a deficient number, since it is larger than the sum of its proper divisors (1209601473).

2261215551 is a wasteful number, since it uses less digits than its factorization.

2261215551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786110.

The product of its digits is 6000, while the sum is 30.

The square root of 2261215551 is about 47552.2402311395. The cubic root of 2261215551 is about 1312.5443530409.

The spelling of 2261215551 in words is "two billion, two hundred sixty-one million, two hundred fifteen thousand, five hundred fifty-one".