2151623 has 2 divisors, whose sum is σ = 2151624. Its totient is φ = 2151622.

The previous prime is 2151619. The next prime is 2151629. The reversal of 2151623 is 3261512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2151623 - 2² = 2151619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2151595 and 2151604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075811 + 1075812.

It is an arithmetic number, because the mean of its divisors is an integer number (1075812).

2^2151623 is an apocalyptic number.

2151623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151623 is an equidigital number, since it uses as much as digits as its factorization.

2151623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 2151623 is about 1466.8411638620. The cubic root of 2151623 is about 129.0987565787.

The spelling of 2151623 in words is "two million, one hundred fifty-one thousand, six hundred twenty-three".