231280649 has 4 divisors (see below), whose sum is σ = 235200720. Its totient is φ = 227360580.

The previous prime is 231280639. The next prime is 231280657. The reversal of 231280649 is 946082132.

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 a de Polignac number, because none of the positive numbers 2^k-231280649 is a prime.

It is a super-2 number, since 2×231280649² = 106981477203722402, which contains 22 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 (231280619) 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, 1959947 + ... + 1960064.

It is an arithmetic number, because the mean of its divisors is an integer number (58800180).

Almost surely, 2^231280649 is an apocalyptic number.

It is an amenable number.

231280649 is a deficient number, since it is larger than the sum of its proper divisors (3920071).

231280649 is an equidigital number, since it uses as much as digits as its factorization.

231280649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920070.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 231280649 is about 15207.9140252699. The cubic root of 231280649 is about 613.8276288307.

The spelling of 231280649 in words is "two hundred thirty-one million, two hundred eighty thousand, six hundred forty-nine".