1649688451 has 2 divisors, whose sum is σ = 1649688452. Its totient is φ = 1649688450.

The previous prime is 1649688437. The next prime is 1649688457. The reversal of 1649688451 is 1548869461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649688451 - 2⁵ = 1649688419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649688457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824844225 + 824844226.

It is an arithmetic number, because the mean of its divisors is an integer number (824844226).

Almost surely, 2^1649688451 is an apocalyptic number.

1649688451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649688451 is an equidigital number, since it uses as much as digits as its factorization.

1649688451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 52.

The square root of 1649688451 is about 40616.3569390461. The cubic root of 1649688451 is about 1181.5913726986.

The spelling of 1649688451 in words is "one billion, six hundred forty-nine million, six hundred eighty-eight thousand, four hundred fifty-one".