249109961 has 4 divisors (see below), whose sum is σ = 252618624. Its totient is φ = 245601300.

The previous prime is 249109943. The next prime is 249109967. The reversal of 249109961 is 169901942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249109961 - 2¹⁴ = 249093577 is a prime.

It is a super-3 number, since 3×249109961³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249109967) 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, 1754225 + ... + 1754366.

It is an arithmetic number, because the mean of its divisors is an integer number (63154656).

Almost surely, 2^249109961 is an apocalyptic number.

It is an amenable number.

249109961 is a deficient number, since it is larger than the sum of its proper divisors (3508663).

249109961 is an equidigital number, since it uses as much as digits as its factorization.

249109961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508662.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 249109961 is about 15783.2177010900. The cubic root of 249109961 is about 629.2120501002.

The spelling of 249109961 in words is "two hundred forty-nine million, one hundred nine thousand, nine hundred sixty-one".