401216751 has 12 divisors (see below), whose sum is σ = 624115128. Its totient is φ = 246902544.

The previous prime is 401216737. The next prime is 401216759. The reversal of 401216751 is 157612104.

It is a happy number.

It is not a de Polignac number, because 401216751 - 2⁹ = 401216239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401216759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1714485 + ... + 1714718.

It is an arithmetic number, because the mean of its divisors is an integer number (52009594).

Almost surely, 2^401216751 is an apocalyptic number.

401216751 is a deficient number, since it is larger than the sum of its proper divisors (222898377).

401216751 is a wasteful number, since it uses less digits than its factorization.

401216751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429222 (or 3429219 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 401216751 is about 20030.3956775696. The cubic root of 401216751 is about 737.5526349870.

Adding to 401216751 its reverse (157612104), we get a palindrome (558828855).

The spelling of 401216751 in words is "four hundred one million, two hundred sixteen thousand, seven hundred fifty-one".