261376939 has 6 divisors (see below), whose sum is σ = 275207820. Its totient is φ = 247553496.

The previous prime is 261376931. The next prime is 261376949. The reversal of 261376939 is 939673162.

It is not a de Polignac number, because 261376939 - 2³ = 261376931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261376931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68617 + ... + 72325.

It is an arithmetic number, because the mean of its divisors is an integer number (45867970).

Almost surely, 2^261376939 is an apocalyptic number.

261376939 is a deficient number, since it is larger than the sum of its proper divisors (13830881).

261376939 is an frugal number, since it uses more digits than its factorization.

261376939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437 (or 3728 counting only the distinct ones).

The product of its digits is 367416, while the sum is 46.

The square root of 261376939 is about 16167.1561815924. The cubic root of 261376939 is about 639.3751543085.

The spelling of 261376939 in words is "two hundred sixty-one million, three hundred seventy-six thousand, nine hundred thirty-nine".