51491111 has 12 divisors (see below), whose sum is σ = 60089400. Its totient is φ = 43994160.

The previous prime is 51491101. The next prime is 51491119. The reversal of 51491111 is 11119415.

It is not a de Polignac number, because 51491111 - 2⁶ = 51491047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491119) 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, 15596 + ... + 18606.

It is an arithmetic number, because the mean of its divisors is an integer number (5007450).

Almost surely, 2^51491111 is an apocalyptic number.

51491111 is a deficient number, since it is larger than the sum of its proper divisors (8598289).

51491111 is a wasteful number, since it uses less digits than its factorization.

51491111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374 (or 3367 counting only the distinct ones).

The product of its digits is 180, while the sum is 23.

The square root of 51491111 is about 7175.7306945007. The cubic root of 51491111 is about 372.0295362334.

The spelling of 51491111 in words is "fifty-one million, four hundred ninety-one thousand, one hundred eleven".