261256150 has 12 divisors (see below), whose sum is σ = 485936532. Its totient is φ = 104502440.

The previous prime is 261256129. The next prime is 261256159. The reversal of 261256150 is 51652162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261256159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2612512 + ... + 2612611.

It is an arithmetic number, because the mean of its divisors is an integer number (40494711).

Almost surely, 2^261256150 is an apocalyptic number.

261256150 is a deficient number, since it is larger than the sum of its proper divisors (224680382).

261256150 is a wasteful number, since it uses less digits than its factorization.

261256150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225135 (or 5225130 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 261256150 is about 16163.4201207541. The cubic root of 261256150 is about 639.2766485701.

The spelling of 261256150 in words is "two hundred sixty-one million, two hundred fifty-six thousand, one hundred fifty".