51020146 has 4 divisors (see below), whose sum is σ = 76530222. Its totient is φ = 25510072.

The previous prime is 51020143. The next prime is 51020153. The reversal of 51020146 is 64102015.

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

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 10634121 = 6355^2 + 3261^2 .

It is a super-2 number, since 2×51020146² = 5206110595722632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51020143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755035 + ... + 12755038.

Almost surely, 2^51020146 is an apocalyptic number.

51020146 is a deficient number, since it is larger than the sum of its proper divisors (25510076).

51020146 is a wasteful number, since it uses less digits than its factorization.

51020146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25510075.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 51020146 is about 7142.8387914050. The cubic root of 51020146 is about 370.8918005809.

The spelling of 51020146 in words is "fifty-one million, twenty thousand, one hundred forty-six".