2051155251 has 16 divisors (see below), whose sum is σ = 3039667200. Its totient is φ = 1367023464.

The previous prime is 2051155243. The next prime is 2051155313. The reversal of 2051155251 is 1525511502.

2051155251 is a `hidden beast` number, since 20 + 5 + 115 + 525 + 1 = 666.

It is not a de Polignac number, because 2051155251 - 2³ = 2051155243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2051154251) 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, 98710 + ... + 117668.

It is an arithmetic number, because the mean of its divisors is an integer number (189979200).

Almost surely, 2^2051155251 is an apocalyptic number.

2051155251 is a deficient number, since it is larger than the sum of its proper divisors (988511949).

2051155251 is a wasteful number, since it uses less digits than its factorization.

2051155251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22975 (or 22969 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The square root of 2051155251 is about 45289.6815069393. The cubic root of 2051155251 is about 1270.5726747470.

Adding to 2051155251 its reverse (1525511502), we get a palindrome (3576666753).

The spelling of 2051155251 in words is "two billion, fifty-one million, one hundred fifty-five thousand, two hundred fifty-one".