2051720415 has 32 divisors (see below), whose sum is σ = 3839481600. Its totient is φ = 1036657440.

The previous prime is 2051720413. The next prime is 2051720477. The reversal of 2051720415 is 5140271502.

It is not a de Polignac number, because 2051720415 - 2¹ = 2051720413 is a prime.

It is a super-2 number, since 2×2051720415² = 8419113322655544450, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051720413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397381 + ... + 402510.

It is an arithmetic number, because the mean of its divisors is an integer number (119983800).

Almost surely, 2^2051720415 is an apocalyptic number.

2051720415 is a deficient number, since it is larger than the sum of its proper divisors (1787761185).

2051720415 is a wasteful number, since it uses less digits than its factorization.

2051720415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799924 (or 799918 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 2051720415 is about 45295.9205116752. The cubic root of 2051720415 is about 1270.6893595588.

Adding to 2051720415 its reverse (5140271502), we get a palindrome (7191991917).

The spelling of 2051720415 in words is "two billion, fifty-one million, seven hundred twenty thousand, four hundred fifteen".