51236139 has 8 divisors (see below), whose sum is σ = 68390352. Its totient is φ = 34119680.

The previous prime is 51236137. The next prime is 51236153. The reversal of 51236139 is 93163215.

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

It is a cyclic number.

It is not a de Polignac number, because 51236139 - 2¹ = 51236137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51236137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6102 + ... + 11819.

It is an arithmetic number, because the mean of its divisors is an integer number (8548794).

Almost surely, 2^51236139 is an apocalyptic number.

51236139 is a deficient number, since it is larger than the sum of its proper divisors (17154213).

51236139 is a wasteful number, since it uses less digits than its factorization.

51236139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18877.

The product of its digits is 4860, while the sum is 30.

The square root of 51236139 is about 7157.9423719390. The cubic root of 51236139 is about 371.4144519640.

The spelling of 51236139 in words is "fifty-one million, two hundred thirty-six thousand, one hundred thirty-nine".