261742045 has 8 divisors (see below), whose sum is σ = 315406080. Its totient is φ = 208516560.

The previous prime is 261742031. The next prime is 261742049. The reversal of 261742045 is 540247162.

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

It is not a de Polignac number, because 261742045 - 2⁹ = 261741533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261741998 and 261742016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261742049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108321 + ... + 110710.

It is an arithmetic number, because the mean of its divisors is an integer number (39425760).

Almost surely, 2^261742045 is an apocalyptic number.

It is an amenable number.

261742045 is a deficient number, since it is larger than the sum of its proper divisors (53664035).

261742045 is a wasteful number, since it uses less digits than its factorization.

261742045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219275.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 261742045 is about 16178.4438374029. The cubic root of 261742045 is about 639.6727208502.

The spelling of 261742045 in words is "two hundred sixty-one million, seven hundred forty-two thousand, forty-five".