2197651 has 2 divisors, whose sum is σ = 2197652. Its totient is φ = 2197650.

The previous prime is 2197633. The next prime is 2197681. The reversal of 2197651 is 1567912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2197651 - 2⁷ = 2197523 is a prime.

It is not a weakly prime, because it can be changed into another prime (2197631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098825 + 1098826.

It is an arithmetic number, because the mean of its divisors is an integer number (1098826).

2^2197651 is an apocalyptic number.

2197651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197651 is an equidigital number, since it uses as much as digits as its factorization.

2197651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 2197651 is about 1482.4476381984. The cubic root of 2197651 is about 130.0128389687.

The spelling of 2197651 in words is "two million, one hundred ninety-seven thousand, six hundred fifty-one".