1649533237 has 4 divisors (see below), whose sum is σ = 1799490816. Its totient is φ = 1499575660.

The previous prime is 1649533231. The next prime is 1649533243. The reversal of 1649533237 is 7323359461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1649533231) and next prime (1649533243).

It is a de Polignac number, because none of the positive numbers 2^k-1649533237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649533193 and 1649533202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649533231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74978773 + ... + 74978794.

It is an arithmetic number, because the mean of its divisors is an integer number (449872704).

Almost surely, 2^1649533237 is an apocalyptic number.

It is an amenable number.

1649533237 is a deficient number, since it is larger than the sum of its proper divisors (149957579).

1649533237 is a wasteful number, since it uses less digits than its factorization.

1649533237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149957578.

The product of its digits is 408240, while the sum is 43.

The square root of 1649533237 is about 40614.4461614337. The cubic root of 1649533237 is about 1181.5543141305.

The spelling of 1649533237 in words is "one billion, six hundred forty-nine million, five hundred thirty-three thousand, two hundred thirty-seven".