312420661 has 32 divisors (see below), whose sum is σ = 382427136. Its totient is φ = 249480000.

The previous prime is 312420659. The next prime is 312420673. The reversal of 312420661 is 166024213.

It is not a de Polignac number, because 312420661 - 2¹ = 312420659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312420601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1725991 + ... + 1726171.

It is an arithmetic number, because the mean of its divisors is an integer number (11950848).

Almost surely, 2^312420661 is an apocalyptic number.

It is an amenable number.

312420661 is a deficient number, since it is larger than the sum of its proper divisors (70006475).

312420661 is a wasteful number, since it uses less digits than its factorization.

312420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 312420661 is about 17675.4253414168. The cubic root of 312420661 is about 678.5469701734.

Adding to 312420661 its reverse (166024213), we get a palindrome (478444874).

The spelling of 312420661 in words is "three hundred twelve million, four hundred twenty thousand, six hundred sixty-one".