131777739 has 16 divisors (see below), whose sum is σ = 198537600. Its totient is φ = 86361768.

The previous prime is 131777713. The next prime is 131777743. The reversal of 131777739 is 937777131.

It is not a de Polignac number, because 131777739 - 2¹¹ = 131775691 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 131777694 and 131777703.

It is not an unprimeable number, because it can be changed into a prime (131777759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39769 + ... + 42954.

It is an arithmetic number, because the mean of its divisors is an integer number (12408600).

Almost surely, 2^131777739 is an apocalyptic number.

131777739 is a deficient number, since it is larger than the sum of its proper divisors (66759861).

131777739 is an equidigital number, since it uses as much as digits as its factorization.

131777739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82791 (or 82785 counting only the distinct ones).

The product of its digits is 194481, while the sum is 45.

The square root of 131777739 is about 11479.4485494731. The cubic root of 131777739 is about 508.8784002208.

The spelling of 131777739 in words is "one hundred thirty-one million, seven hundred seventy-seven thousand, seven hundred thirty-nine".