51377481 has 6 divisors (see below), whose sum is σ = 74211930. Its totient is φ = 34251648.

The previous prime is 51377479. The next prime is 51377483. The reversal of 51377481 is 18477315.

It is an interprime number because it is at equal distance from previous prime (51377479) and next prime (51377483).

It can be written as a sum of positive squares in only one way, i.e., 47610000 + 3767481 = 6900^2 + 1941^2 .

It is not a de Polignac number, because 51377481 - 2¹ = 51377479 is a prime.

It is a super-2 number, since 2×51377481² = 5279291107810722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51377483) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2854296 + ... + 2854313.

It is an arithmetic number, because the mean of its divisors is an integer number (12368655).

Almost surely, 2^51377481 is an apocalyptic number.

It is an amenable number.

51377481 is a deficient number, since it is larger than the sum of its proper divisors (22834449).

51377481 is a wasteful number, since it uses less digits than its factorization.

51377481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5708615 (or 5708612 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 51377481 is about 7167.8086609507. The cubic root of 51377481 is about 371.7556711595.

The spelling of 51377481 in words is "fifty-one million, three hundred seventy-seven thousand, four hundred eighty-one".