50991283621 has 2 divisors, whose sum is σ = 50991283622. Its totient is φ = 50991283620.

The previous prime is 50991283601. The next prime is 50991283939. The reversal of 50991283621 is 12638219905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40475806596 + 10515477025 = 201186^2 + 102545^2 .

It is a cyclic number.

It is not a de Polignac number, because 50991283621 - 2¹³ = 50991275429 is a prime.

It is a super-2 number, since 2×50991283621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50991283601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25495641810 + 25495641811.

It is an arithmetic number, because the mean of its divisors is an integer number (25495641811).

Almost surely, 2^50991283621 is an apocalyptic number.

It is an amenable number.

50991283621 is a deficient number, since it is larger than the sum of its proper divisors (1).

50991283621 is an equidigital number, since it uses as much as digits as its factorization.

50991283621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 50991283621 in words is "fifty billion, nine hundred ninety-one million, two hundred eighty-three thousand, six hundred twenty-one".