2151745 has 8 divisors (see below), whose sum is σ = 2591784. Its totient is φ = 1714944.

The previous prime is 2151703. The next prime is 2151767. The reversal of 2151745 is 5471512.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 1985281 = 408^2 + 1409^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151745 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (323973).

2^2151745 is an apocalyptic number.

It is an amenable number.

2151745 is a deficient number, since it is larger than the sum of its proper divisors (440039).

2151745 is a wasteful number, since it uses less digits than its factorization.

2151745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619.

The product of its digits is 1400, while the sum is 25.

The square root of 2151745 is about 1466.8827492339. The cubic root of 2151745 is about 129.1011965586.

The spelling of 2151745 in words is "two million, one hundred fifty-one thousand, seven hundred forty-five".