2151523 has 4 divisors (see below), whose sum is σ = 2347128. Its totient is φ = 1955920.

The previous prime is 2151521. The next prime is 2151533. The reversal of 2151523 is 3251512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151523 - 2¹ = 2151521 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 2151523.

It is not an unprimeable number, because it can be changed into a prime (2151521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97786 + ... + 97807.

It is an arithmetic number, because the mean of its divisors is an integer number (586782).

2^2151523 is an apocalyptic number.

2151523 is a deficient number, since it is larger than the sum of its proper divisors (195605).

2151523 is a wasteful number, since it uses less digits than its factorization.

2151523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195604.

The product of its digits is 300, while the sum is 19.

The square root of 2151523 is about 1466.8070766123. The cubic root of 2151523 is about 129.0967565264.

It can be divided in two parts, 2 and 151523, that added together give a triangular number (151525 = T₅₅₀).

The spelling of 2151523 in words is "two million, one hundred fifty-one thousand, five hundred twenty-three".