1914739155081 has 15 divisors (see below), whose sum is σ = 2860307958871. Its totient is φ = 1276484467608.

The previous prime is 1914739155067. The next prime is 1914739155083. The reversal of 1914739155081 is 1805519374191.

The square root of 1914739155081 is 1383741.

It is a perfect power (a square), and thus also a powerful number.

1914739155081 is a `hidden beast` number, since 1 + 9 + 1 + 4 + 7 + 3 + 9 + 1 + 550 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 538669391481 + 1376069763600 = 733941^2 + 1173060^2 .

It is not a de Polignac number, because 1914739155081 - 2⁷ = 1914739154953 is a prime.

It is a super-2 number, since 2×1914739155081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1914739155083) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 12376795 + ... + 12530543.

Almost surely, 2^{1914739155081} is an apocalyptic number.

1914739155081 is the 1383741-st square number.

1914739155081 is the 691871-st centered octagonal number.

It is an amenable number.

1914739155081 is a deficient number, since it is larger than the sum of its proper divisors (945568803790).

1914739155081 is an frugal number, since it uses more digits than its factorization.

1914739155081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307510 (or 153752 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 54.

The spelling of 1914739155081 in words is "one trillion, nine hundred fourteen billion, seven hundred thirty-nine million, one hundred fifty-five thousand, eighty-one".