2151471 has 8 divisors (see below), whose sum is σ = 3278464. Its totient is φ = 1229400.

The previous prime is 2151467. The next prime is 2151473. The reversal of 2151471 is 1741512.

It is a happy number.

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

It is not a de Polignac number, because 2151471 - 2² = 2151467 is a prime.

It is a super-3 number, since 3×2151471³ = 29876364157372380333, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 102451 = 2151471 / (2 + 1 + 5 + 1 + 4 + 7 + 1).

2151471 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151473) 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, 51205 + ... + 51246.

It is an arithmetic number, because the mean of its divisors is an integer number (409808).

2^2151471 is an apocalyptic number.

2151471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2151471 is a deficient number, since it is larger than the sum of its proper divisors (1126993).

2151471 is a wasteful number, since it uses less digits than its factorization.

2151471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102461.

The product of its digits is 280, while the sum is 21.

The square root of 2151471 is about 1466.7893509294. The cubic root of 2151471 is about 129.0957164747.

Adding to 2151471 its reverse (1741512), we get a palindrome (3892983).

The spelling of 2151471 in words is "two million, one hundred fifty-one thousand, four hundred seventy-one".