51161398 has 8 divisors (see below), whose sum is σ = 81256392. Its totient is φ = 24075936.

The previous prime is 51161387. The next prime is 51161413. The reversal of 51161398 is 89316115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 1504747 = 51161398 / (5 + 1 + 1 + 6 + 1 + 3 + 9 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752340 + ... + 752407.

It is an arithmetic number, because the mean of its divisors is an integer number (10157049).

Almost surely, 2^51161398 is an apocalyptic number.

51161398 is a deficient number, since it is larger than the sum of its proper divisors (30094994).

51161398 is a wasteful number, since it uses less digits than its factorization.

51161398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504766.

The product of its digits is 6480, while the sum is 34.

The square root of 51161398 is about 7152.7196226331. The cubic root of 51161398 is about 371.2337631159.

The spelling of 51161398 in words is "fifty-one million, one hundred sixty-one thousand, three hundred ninety-eight".