212781465 has 64 divisors (see below), whose sum is σ = 409812480. Its totient is φ = 104129280.

The previous prime is 212781419. The next prime is 212781493. The reversal of 212781465 is 564187212.

It is not a de Polignac number, because 212781465 - 2¹⁰ = 212780441 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 461335 + ... + 461795.

It is an arithmetic number, because the mean of its divisors is an integer number (6403320).

Almost surely, 2^212781465 is an apocalyptic number.

It is an amenable number.

212781465 is a deficient number, since it is larger than the sum of its proper divisors (197031015).

212781465 is a wasteful number, since it uses less digits than its factorization.

212781465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751 (or 745 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 212781465 is about 14587.0307122457. The cubic root of 212781465 is about 597.0049493289.

The spelling of 212781465 in words is "two hundred twelve million, seven hundred eighty-one thousand, four hundred sixty-five".