249997961 has 4 divisors (see below), whose sum is σ = 250212624. Its totient is φ = 249783300.

The previous prime is 249997939. The next prime is 249997963. The reversal of 249997961 is 169799942.

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 249997961 - 2⁶ = 249997897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249997897 and 249997906.

It is not an unprimeable number, because it can be changed into a prime (249997963) 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, 105575 + ... + 107916.

It is an arithmetic number, because the mean of its divisors is an integer number (62553156).

Almost surely, 2^249997961 is an apocalyptic number.

It is an amenable number.

249997961 is a deficient number, since it is larger than the sum of its proper divisors (214663).

249997961 is a wasteful number, since it uses less digits than its factorization.

249997961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214662.

The product of its digits is 2204496, while the sum is 56.

The square root of 249997961 is about 15811.3238218689. The cubic root of 249997961 is about 629.9588122901.

The spelling of 249997961 in words is "two hundred forty-nine million, nine hundred ninety-seven thousand, nine hundred sixty-one".