2051315261 has 8 divisors (see below), whose sum is σ = 2179404120. Its totient is φ = 1927050048.

The previous prime is 2051315249. The next prime is 2051315267. The reversal of 2051315261 is 1625131502.

It can be written as a sum of positive squares in 4 ways, for example, as 298218361 + 1753096900 = 17269^2 + 41870^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2051315261 - 2¹⁸ = 2051053117 is a prime.

It is a super-2 number, since 2×2051315261² = 8415788600022996242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051315261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051315267) 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, 954806 + ... + 956951.

It is an arithmetic number, because the mean of its divisors is an integer number (272425515).

Almost surely, 2^2051315261 is an apocalyptic number.

It is an amenable number.

2051315261 is a deficient number, since it is larger than the sum of its proper divisors (128088859).

2051315261 is a wasteful number, since it uses less digits than its factorization.

2051315261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911823.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2051315261 is about 45291.4479896592. The cubic root of 2051315261 is about 1270.6057128845.

Adding to 2051315261 its reverse (1625131502), we get a palindrome (3676446763).

The spelling of 2051315261 in words is "two billion, fifty-one million, three hundred fifteen thousand, two hundred sixty-one".