149143135681 has 2 divisors, whose sum is σ = 149143135682. Its totient is φ = 149143135680.

The previous prime is 149143135649. The next prime is 149143135789. The reversal of 149143135681 is 186531341941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87547341456 + 61595794225 = 295884^2 + 248185^2 .

It is a cyclic number.

It is not a de Polignac number, because 149143135681 - 2⁵ = 149143135649 is a prime.

It is a super-2 number, since 2×149143135681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149143130681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74571567840 + 74571567841.

It is an arithmetic number, because the mean of its divisors is an integer number (74571567841).

Almost surely, 2^149143135681 is an apocalyptic number.

It is an amenable number.

149143135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

149143135681 is an equidigital number, since it uses as much as digits as its factorization.

149143135681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The spelling of 149143135681 in words is "one hundred forty-nine billion, one hundred forty-three million, one hundred thirty-five thousand, six hundred eighty-one".