1631940349 has 8 divisors (see below), whose sum is σ = 1757788760. Its totient is φ = 1506136896.

The previous prime is 1631940337. The next prime is 1631940383. The reversal of 1631940349 is 9430491361.

It can be written as a sum of positive squares in 4 ways, for example, as 60372900 + 1571567449 = 7770^2 + 39643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1631940349 - 2²⁷ = 1497722621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631940749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129559 + ... + 141595.

It is an arithmetic number, because the mean of its divisors is an integer number (219723595).

Almost surely, 2^1631940349 is an apocalyptic number.

It is an amenable number.

1631940349 is a deficient number, since it is larger than the sum of its proper divisors (125848411).

1631940349 is a wasteful number, since it uses less digits than its factorization.

1631940349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22479.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 1631940349 is about 40397.2814555633. The cubic root of 1631940349 is about 1177.3387187804.

The spelling of 1631940349 in words is "one billion, six hundred thirty-one million, nine hundred forty thousand, three hundred forty-nine".