1649136197 has 2 divisors, whose sum is σ = 1649136198. Its totient is φ = 1649136196.

The previous prime is 1649136173. The next prime is 1649136227. The reversal of 1649136197 is 7916319461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1425364516 + 223771681 = 37754^2 + 14959^2 .

It is an emirp because it is prime and its reverse (7916319461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649136197 - 2¹² = 1649132101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649136107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824568098 + 824568099.

It is an arithmetic number, because the mean of its divisors is an integer number (824568099).

Almost surely, 2^1649136197 is an apocalyptic number.

It is an amenable number.

1649136197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649136197 is an equidigital number, since it uses as much as digits as its factorization.

1649136197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 1649136197 is about 40609.5579513001. The cubic root of 1649136197 is about 1181.4595071151.

The spelling of 1649136197 in words is "one billion, six hundred forty-nine million, one hundred thirty-six thousand, one hundred ninety-seven".