261820942 has 4 divisors (see below), whose sum is σ = 392731416. Its totient is φ = 130910470.

The previous prime is 261820877. The next prime is 261820963. The reversal of 261820942 is 249028162.

261820942 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 261820898 and 261820907.

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, 65455234 + ... + 65455237.

It is an arithmetic number, because the mean of its divisors is an integer number (98182854).

Almost surely, 2^261820942 is an apocalyptic number.

261820942 is a deficient number, since it is larger than the sum of its proper divisors (130910474).

261820942 is a wasteful number, since it uses less digits than its factorization.

261820942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130910473.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 261820942 is about 16180.8819907940. The cubic root of 261820942 is about 639.7369866538.

It can be divided in two parts, 2618 and 20942, that multiplied together give a triangular number (54826156 = T₁₀₄₇₁).

The spelling of 261820942 in words is "two hundred sixty-one million, eight hundred twenty thousand, nine hundred forty-two".