2151009 has 32 divisors (see below), whose sum is σ = 3840000. Its totient is φ = 1162512.

The previous prime is 2151007. The next prime is 2151011. The reversal of 2151009 is 9001512.

It is an interprime number because it is at equal distance from previous prime (2151007) and next prime (2151011).

It is not a de Polignac number, because 2151009 - 2¹ = 2151007 is a prime.

It is a Curzon number.

2151009 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2150982 and 2151000.

It is not an unprimeable number, because it can be changed into a prime (2151001) 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, 3292 + ... + 3890.

It is an arithmetic number, because the mean of its divisors is an integer number (120000).

2^2151009 is an apocalyptic number.

It is an amenable number.

2151009 is a deficient number, since it is larger than the sum of its proper divisors (1688991).

2151009 is a wasteful number, since it uses less digits than its factorization.

2151009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 2151009 is about 1466.6318556475. The cubic root of 2151009 is about 129.0864752795.

The spelling of 2151009 in words is "two million, one hundred fifty-one thousand, nine".