631544387 has 4 divisors (see below), whose sum is σ = 632639496. Its totient is φ = 630449280.

The previous prime is 631544383. The next prime is 631544393. The reversal of 631544387 is 783445136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631544387 - 2² = 631544383 is a prime.

It is a super-3 number, since 3×631544387³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631544383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546689 + ... + 547842.

It is an arithmetic number, because the mean of its divisors is an integer number (158159874).

Almost surely, 2^631544387 is an apocalyptic number.

631544387 is a deficient number, since it is larger than the sum of its proper divisors (1095109).

631544387 is a wasteful number, since it uses less digits than its factorization.

631544387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095108.

The product of its digits is 241920, while the sum is 41.

The square root of 631544387 is about 25130.5468901892. The cubic root of 631544387 is about 857.9618161384.

The spelling of 631544387 in words is "six hundred thirty-one million, five hundred forty-four thousand, three hundred eighty-seven".