261851042 has 8 divisors (see below), whose sum is σ = 396447696. Its totient is φ = 129701812.

The previous prime is 261851003. The next prime is 261851059. The reversal of 261851042 is 240158162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 261850996 and 261851014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611588 + ... + 612015.

It is an arithmetic number, because the mean of its divisors is an integer number (49555962).

Almost surely, 2^261851042 is an apocalyptic number.

261851042 is a deficient number, since it is larger than the sum of its proper divisors (134596654).

261851042 is a wasteful number, since it uses less digits than its factorization.

261851042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223712.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 261851042 is about 16181.8120740540. The cubic root of 261851042 is about 639.7615013028.

The spelling of 261851042 in words is "two hundred sixty-one million, eight hundred fifty-one thousand, forty-two".