1956649973 has 2 divisors, whose sum is σ = 1956649974. Its totient is φ = 1956649972.

The previous prime is 1956649949. The next prime is 1956649991. The reversal of 1956649973 is 3799466591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1320450244 + 636199729 = 36338^2 + 25223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1956649973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1956642973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978324986 + 978324987.

It is an arithmetic number, because the mean of its divisors is an integer number (978324987).

Almost surely, 2^1956649973 is an apocalyptic number.

It is an amenable number.

1956649973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956649973 is an equidigital number, since it uses as much as digits as its factorization.

1956649973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 59.

The square root of 1956649973 is about 44234.0363634159. The cubic root of 1956649973 is about 1250.7515422968.

The spelling of 1956649973 in words is "one billion, nine hundred fifty-six million, six hundred forty-nine thousand, nine hundred seventy-three".