1381097951993 has 2 divisors, whose sum is σ = 1381097951994. Its totient is φ = 1381097951992.

The previous prime is 1381097951923. The next prime is 1381097952061. The reversal of 1381097951993 is 3991597901831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1048264727104 + 332833224889 = 1023848^2 + 576917^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381097951993 - 2¹² = 1381097947897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381097951923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690548975996 + 690548975997.

It is an arithmetic number, because the mean of its divisors is an integer number (690548975997).

Almost surely, 2^{1381097951993} is an apocalyptic number.

It is an amenable number.

1381097951993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381097951993 is an equidigital number, since it uses as much as digits as its factorization.

1381097951993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16533720, while the sum is 65.

The spelling of 1381097951993 in words is "one trillion, three hundred eighty-one billion, ninety-seven million, nine hundred fifty-one thousand, nine hundred ninety-three".