137777749 has 4 divisors (see below), whose sum is σ = 138783564. Its totient is φ = 136771936.

The previous prime is 137777737. The next prime is 137777771. The reversal of 137777749 is 947777731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947777731 = 5119 ⋅185149.

It can be written as a sum of positive squares in 2 ways, for example, as 104346225 + 33431524 = 10215^2 + 5782^2 .

It is a cyclic number.

It is not a de Polignac number, because 137777749 - 2¹³ = 137769557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 137777696 and 137777705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137777779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502702 + ... + 502975.

It is an arithmetic number, because the mean of its divisors is an integer number (34695891).

Almost surely, 2^137777749 is an apocalyptic number.

It is an amenable number.

137777749 is a deficient number, since it is larger than the sum of its proper divisors (1005815).

137777749 is a wasteful number, since it uses less digits than its factorization.

137777749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005814.

The product of its digits is 1815156, while the sum is 52.

The square root of 137777749 is about 11737.8766819216. The cubic root of 137777749 is about 516.4873570400.

The spelling of 137777749 in words is "one hundred thirty-seven million, seven hundred seventy-seven thousand, seven hundred forty-nine".