51709654 has 4 divisors (see below), whose sum is σ = 77564484. Its totient is φ = 25854826.

The previous prime is 51709649. The next prime is 51709657. The reversal of 51709654 is 45690715.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51709657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12927412 + ... + 12927415.

It is an arithmetic number, because the mean of its divisors is an integer number (19391121).

Almost surely, 2^51709654 is an apocalyptic number.

51709654 is a deficient number, since it is larger than the sum of its proper divisors (25854830).

51709654 is a wasteful number, since it uses less digits than its factorization.

51709654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25854829.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 51709654 is about 7190.9424973365. The cubic root of 51709654 is about 372.5551265951. Note that the first 3 decimals are identical.

The spelling of 51709654 in words is "fifty-one million, seven hundred nine thousand, six hundred fifty-four".