1651499749 has 2 divisors, whose sum is σ = 1651499750. Its totient is φ = 1651499748.

The previous prime is 1651499747. The next prime is 1651499777. The reversal of 1651499749 is 9479941561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1646898724 + 4601025 = 40582^2 + 2145^2 .

It is an emirp because it is prime and its reverse (9479941561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651499749 - 2¹ = 1651499747 is a prime.

Together with 1651499747, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1651499749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651499747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825749874 + 825749875.

It is an arithmetic number, because the mean of its divisors is an integer number (825749875).

Almost surely, 2^1651499749 is an apocalyptic number.

It is an amenable number.

1651499749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651499749 is an equidigital number, since it uses as much as digits as its factorization.

1651499749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 1651499749 is about 40638.6484642391. The cubic root of 1651499749 is about 1182.0236626609.

The spelling of 1651499749 in words is "one billion, six hundred fifty-one million, four hundred ninety-nine thousand, seven hundred forty-nine".