261377374 has 4 divisors (see below), whose sum is σ = 392066064. Its totient is φ = 130688686.

The previous prime is 261377339. The next prime is 261377381. The reversal of 261377374 is 473773162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 473773162 = 2 ⋅236886581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65344342 + ... + 65344345.

It is an arithmetic number, because the mean of its divisors is an integer number (98016516).

Almost surely, 2^261377374 is an apocalyptic number.

261377374 is a deficient number, since it is larger than the sum of its proper divisors (130688690).

261377374 is a wasteful number, since it uses less digits than its factorization.

261377374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130688689.

The product of its digits is 148176, while the sum is 40.

The square root of 261377374 is about 16167.1696347877. The cubic root of 261377374 is about 639.3755090044.

The spelling of 261377374 in words is "two hundred sixty-one million, three hundred seventy-seven thousand, three hundred seventy-four".