135375490781 has 2 divisors, whose sum is σ = 135375490782. Its totient is φ = 135375490780.

The previous prime is 135375490741. The next prime is 135375490807. The reversal of 135375490781 is 187094573531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133122089881 + 2253400900 = 364859^2 + 47470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135375490781 is a prime.

It is a super-2 number, since 2×135375490781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135375490741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67687745390 + 67687745391.

It is an arithmetic number, because the mean of its divisors is an integer number (67687745391).

Almost surely, 2^135375490781 is an apocalyptic number.

It is an amenable number.

135375490781 is a deficient number, since it is larger than the sum of its proper divisors (1).

135375490781 is an equidigital number, since it uses as much as digits as its factorization.

135375490781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 135375490781 in words is "one hundred thirty-five billion, three hundred seventy-five million, four hundred ninety thousand, seven hundred eighty-one".