51149639 has 2 divisors, whose sum is σ = 51149640. Its totient is φ = 51149638.

The previous prime is 51149633. The next prime is 51149687. The reversal of 51149639 is 93694115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51149639 - 2⁸ = 51149383 is a prime.

It is a Chen prime.

It is equal to p_3065879 and since 51149639 and 3065879 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51149633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25574819 + 25574820.

It is an arithmetic number, because the mean of its divisors is an integer number (25574820).

Almost surely, 2^51149639 is an apocalyptic number.

51149639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51149639 is an equidigital number, since it uses as much as digits as its factorization.

51149639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 38.

The square root of 51149639 is about 7151.8975803629. The cubic root of 51149639 is about 371.2053193251.

The spelling of 51149639 in words is "fifty-one million, one hundred forty-nine thousand, six hundred thirty-nine".