1631926949 has 2 divisors, whose sum is σ = 1631926950. Its totient is φ = 1631926948.

The previous prime is 1631926943. The next prime is 1631926957. The reversal of 1631926949 is 9496291361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1630705924 + 1221025 = 40382^2 + 1105^2 .

It is an emirp because it is prime and its reverse (9496291361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1631926949 - 2²⁴ = 1615149733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631926897 and 1631926906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631926943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815963474 + 815963475.

It is an arithmetic number, because the mean of its divisors is an integer number (815963475).

Almost surely, 2^1631926949 is an apocalyptic number.

It is an amenable number.

1631926949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631926949 is an equidigital number, since it uses as much as digits as its factorization.

1631926949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The square root of 1631926949 is about 40397.1156024784. The cubic root of 1631926949 is about 1177.3354963624.

The spelling of 1631926949 in words is "one billion, six hundred thirty-one million, nine hundred twenty-six thousand, nine hundred forty-nine".