1993512761 has 2 divisors, whose sum is σ = 1993512762. Its totient is φ = 1993512760.

The previous prime is 1993512749. The next prime is 1993512767. The reversal of 1993512761 is 1672153991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1430352400 + 563160361 = 37820^2 + 23731^2 .

It is an emirp because it is prime and its reverse (1672153991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1993512761 - 2¹⁴ = 1993496377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1993512767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996756380 + 996756381.

It is an arithmetic number, because the mean of its divisors is an integer number (996756381).

Almost surely, 2^1993512761 is an apocalyptic number.

It is an amenable number.

1993512761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993512761 is an equidigital number, since it uses as much as digits as its factorization.

1993512761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 44.

The square root of 1993512761 is about 44648.7711029094. The cubic root of 1993512761 is about 1258.5573395492.

The spelling of 1993512761 in words is "one billion, nine hundred ninety-three million, five hundred twelve thousand, seven hundred sixty-one".