135331997 has 2 divisors, whose sum is σ = 135331998. Its totient is φ = 135331996.

The previous prime is 135331979. The next prime is 135332011. The reversal of 135331997 is 799133531.

Together with previous prime (135331979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105966436 + 29365561 = 10294^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 135331997 - 2¹⁰ = 135330973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135331907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67665998 + 67665999.

It is an arithmetic number, because the mean of its divisors is an integer number (67665999).

Almost surely, 2^135331997 is an apocalyptic number.

It is an amenable number.

135331997 is a deficient number, since it is larger than the sum of its proper divisors (1).

135331997 is an equidigital number, since it uses as much as digits as its factorization.

135331997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 41.

The square root of 135331997 is about 11633.2281418358. The cubic root of 135331997 is about 513.4129633688.

The spelling of 135331997 in words is "one hundred thirty-five million, three hundred thirty-one thousand, nine hundred ninety-seven".