51491007489 has 8 divisors (see below), whose sum is σ = 68655863200. Its totient is φ = 34326745056.

The previous prime is 51491007461. The next prime is 51491007493. The reversal of 51491007489 is 98470019415.

51491007489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51491007489 - 2¹² = 51491003393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51491007089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127437 + ... + 345285.

It is an arithmetic number, because the mean of its divisors is an integer number (8581982900).

Almost surely, 2^51491007489 is an apocalyptic number.

It is an amenable number.

51491007489 is a deficient number, since it is larger than the sum of its proper divisors (17164855711).

51491007489 is a wasteful number, since it uses less digits than its factorization.

51491007489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296639.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 51491007489 in words is "fifty-one billion, four hundred ninety-one million, seven thousand, four hundred eighty-nine".