261250031 has 8 divisors (see below), whose sum is σ = 311553024. Its totient is φ = 214192440.

The previous prime is 261250027. The next prime is 261250039. The reversal of 261250031 is 130052162.

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

It is not a de Polignac number, because 261250031 - 2² = 261250027 is a prime.

It is a super-2 number, since 2×261250031² = 136503157395001922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261249985 and 261250012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261250039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811175 + ... + 811496.

It is an arithmetic number, because the mean of its divisors is an integer number (38944128).

Almost surely, 2^261250031 is an apocalyptic number.

261250031 is a deficient number, since it is larger than the sum of its proper divisors (50302993).

261250031 is a wasteful number, since it uses less digits than its factorization.

261250031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622701.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 261250031 is about 16163.2308342113. The cubic root of 261250031 is about 639.2716576007.

The spelling of 261250031 in words is "two hundred sixty-one million, two hundred fifty thousand, thirty-one".