2151651 has 8 divisors (see below), whose sum is σ = 2877120. Its totient is φ = 1430312.

The previous prime is 2151647. The next prime is 2151659. The reversal of 2151651 is 1561512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151651 - 2² = 2151647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2151659) 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, 520 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (359640).

2^2151651 is an apocalyptic number.

2151651 is a deficient number, since it is larger than the sum of its proper divisors (725469).

2151651 is a wasteful number, since it uses less digits than its factorization.

2151651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065.

The product of its digits is 300, while the sum is 21.

The square root of 2151651 is about 1466.8507081499. The cubic root of 2151651 is about 129.0993165823.

It can be divided in two parts, 2151 and 651, that multiplied together give a triangular number (1400301 = T₁₆₇₃).

The spelling of 2151651 in words is "two million, one hundred fifty-one thousand, six hundred fifty-one".