51961530 has 16 divisors (see below), whose sum is σ = 124707744. Its totient is φ = 13856400.

The previous prime is 51961519. The next prime is 51961541. The reversal of 51961530 is 3516915.

It is an interprime number because it is at equal distance from previous prime (51961519) and next prime (51961541).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1732051 = 51961530 / (5 + 1 + 9 + 6 + 1 + 5 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865996 + ... + 866055.

It is an arithmetic number, because the mean of its divisors is an integer number (7794234).

Almost surely, 2^51961530 is an apocalyptic number.

51961530 is an abundant number, since it is smaller than the sum of its proper divisors (72746214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51961530 is a wasteful number, since it uses less digits than its factorization.

51961530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732061.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51961530 is about 7208.4346428334. The cubic root of 51961530 is about 373.1590482918.

The spelling of 51961530 in words is "fifty-one million, nine hundred sixty-one thousand, five hundred thirty".