2151117 has 10 divisors (see below), whose sum is σ = 3213518. Its totient is φ = 1434024.

The previous prime is 2151101. The next prime is 2151119. The reversal of 2151117 is 7111512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 352836 = 1341^2 + 594^2 .

It is not a de Polignac number, because 2151117 - 2⁴ = 2151101 is a prime.

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 2151117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151119) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13198 + ... + 13359.

2^2151117 is an apocalyptic number.

2151117 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2151117 is a deficient number, since it is larger than the sum of its proper divisors (1062401).

2151117 is an equidigital number, since it uses as much as digits as its factorization.

2151117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26569 (or 26560 counting only the distinct ones).

The product of its digits is 70, while the sum is 18.

The square root of 2151117 is about 1466.6686742411. The cubic root of 2151117 is about 129.0886356774.

Adding to 2151117 its reverse (7111512), we get a palindrome (9262629).

It can be divided in two parts, 21511 and 17, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 2151117 in words is "two million, one hundred fifty-one thousand, one hundred seventeen".