2151245 has 8 divisors (see below), whose sum is σ = 2664960. Its totient is φ = 1665360.

The previous prime is 2151241. The next prime is 2151251. The reversal of 2151245 is 5421512.

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

It is not a de Polignac number, because 2151245 - 2² = 2151241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151241) 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, 6785 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (333120).

2^2151245 is an apocalyptic number.

It is an amenable number.

2151245 is a deficient number, since it is larger than the sum of its proper divisors (513715).

2151245 is a wasteful number, since it uses less digits than its factorization.

2151245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13915.

The product of its digits is 400, while the sum is 20.

The square root of 2151245 is about 1466.7123098958. The cubic root of 2151245 is about 129.0911960553.

Adding to 2151245 its reverse (5421512), we get a palindrome (7572757).

The spelling of 2151245 in words is "two million, one hundred fifty-one thousand, two hundred forty-five".