1649987371 has 2 divisors, whose sum is σ = 1649987372. Its totient is φ = 1649987370.

The previous prime is 1649987347. The next prime is 1649987399. The reversal of 1649987371 is 1737899461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1649987371 - 2⁷ = 1649987243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649987671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824993685 + 824993686.

It is an arithmetic number, because the mean of its divisors is an integer number (824993686).

Almost surely, 2^1649987371 is an apocalyptic number.

1649987371 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649987371 is an equidigital number, since it uses as much as digits as its factorization.

1649987371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 1649987371 is about 40620.0365706384. The cubic root of 1649987371 is about 1181.6627356605.

The spelling of 1649987371 in words is "one billion, six hundred forty-nine million, nine hundred eighty-seven thousand, three hundred seventy-one".