261148999 has 4 divisors (see below), whose sum is σ = 261209800. Its totient is φ = 261088200.

The previous prime is 261148949. The next prime is 261149011. The reversal of 261148999 is 999841162.

It is a happy number.

261148999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261148999 - 2¹⁷ = 261017927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261148949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23424 + ... + 32725.

It is an arithmetic number, because the mean of its divisors is an integer number (65302450).

Almost surely, 2^261148999 is an apocalyptic number.

261148999 is a deficient number, since it is larger than the sum of its proper divisors (60801).

261148999 is an equidigital number, since it uses as much as digits as its factorization.

261148999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60800.

The product of its digits is 279936, while the sum is 49.

The square root of 261148999 is about 16160.1051667370. The cubic root of 261148999 is about 639.1892394647.

The spelling of 261148999 in words is "two hundred sixty-one million, one hundred forty-eight thousand, nine hundred ninety-nine".