51609463 has 4 divisors (see below), whose sum is σ = 51777880. Its totient is φ = 51441048.

The previous prime is 51609461. The next prime is 51609479. The reversal of 51609463 is 36490615.

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

It is a cyclic number.

It is not a de Polignac number, because 51609463 - 2¹ = 51609461 is a prime.

It is a super-2 number, since 2×51609463² = 5327073342296738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51609461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83748 + ... + 84361.

It is an arithmetic number, because the mean of its divisors is an integer number (12944470).

Almost surely, 2^51609463 is an apocalyptic number.

51609463 is a deficient number, since it is larger than the sum of its proper divisors (168417).

51609463 is a wasteful number, since it uses less digits than its factorization.

51609463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168416.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 51609463 is about 7183.9726474980. The cubic root of 51609463 is about 372.3143539898.

The spelling of 51609463 in words is "fifty-one million, six hundred nine thousand, four hundred sixty-three".