51491110 has 32 divisors (see below), whose sum is σ = 101751552. Its totient is φ = 18605280.

The previous prime is 51491101. The next prime is 51491119. The reversal of 51491110 is 1119415.

It is an interprime number because it is at equal distance from previous prime (51491101) and next prime (51491119).

It is a Harshad number since it is a multiple of its sum of digits (22).

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16969 + ... + 19771.

It is an arithmetic number, because the mean of its divisors is an integer number (3179736).

Almost surely, 2^51491110 is an apocalyptic number.

51491110 is a deficient number, since it is larger than the sum of its proper divisors (50260442).

51491110 is a wasteful number, since it uses less digits than its factorization.

51491110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 51491110 is about 7175.7306248214. The cubic root of 51491110 is about 372.0295338251.

The spelling of 51491110 in words is "fifty-one million, four hundred ninety-one thousand, one hundred ten".