631416385 has 8 divisors (see below), whose sum is σ = 760845096. Its totient is φ = 503036160.

The previous prime is 631416367. The next prime is 631416413. The reversal of 631416385 is 583614136.

It is a Cunningham number, because it is equal to 25128²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 227285776 + 404130609 = 15076^2 + 20103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631416385 - 2¹⁷ = 631285313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260794 + ... + 263203.

It is an arithmetic number, because the mean of its divisors is an integer number (95105637).

Almost surely, 2^631416385 is an apocalyptic number.

It is an amenable number.

631416385 is a deficient number, since it is larger than the sum of its proper divisors (129428711).

631416385 is a wasteful number, since it uses less digits than its factorization.

631416385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524243.

The product of its digits is 51840, while the sum is 37.

The square root of 631416385 is about 25128.0000198981. Note that the first 4 decimals coincide. The cubic root of 631416385 is about 857.9038480573.

The spelling of 631416385 in words is "six hundred thirty-one million, four hundred sixteen thousand, three hundred eighty-five".