261313750 has 40 divisors (see below), whose sum is σ = 492030000. Its totient is φ = 104052000.

The previous prime is 261313727. The next prime is 261313753. The reversal of 261313750 is 57313162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261313753) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 435951 + ... + 436549.

It is an arithmetic number, because the mean of its divisors is an integer number (12300750).

Almost surely, 2^261313750 is an apocalyptic number.

261313750 is a deficient number, since it is larger than the sum of its proper divisors (230716250).

261313750 is an equidigital number, since it uses as much as digits as its factorization.

261313750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 261313750 is about 16165.2018236705. The cubic root of 261313750 is about 639.3236262574.

The spelling of 261313750 in words is "two hundred sixty-one million, three hundred thirteen thousand, seven hundred fifty".