261406001 has 8 divisors (see below), whose sum is σ = 264591264. Its totient is φ = 258239520.

The previous prime is 261405973. The next prime is 261406003. The reversal of 261406001 is 100604162.

It is a happy number.

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

It is not a de Polignac number, because 261406001 - 2¹⁴ = 261389617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261406003) 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, 24386 + ... + 33428.

It is an arithmetic number, because the mean of its divisors is an integer number (33073908).

Almost surely, 2^261406001 is an apocalyptic number.

It is an amenable number.

261406001 is a deficient number, since it is larger than the sum of its proper divisors (3185263).

261406001 is a wasteful number, since it uses less digits than its factorization.

261406001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 261406001 is about 16168.0549541372. The cubic root of 261406001 is about 639.3988503955.

The spelling of 261406001 in words is "two hundred sixty-one million, four hundred six thousand, one".