51229997 has 8 divisors (see below), whose sum is σ = 63052416. Its totient is φ = 40533552.

The previous prime is 51229987. The next prime is 51230021. The reversal of 51229997 is 79992215.

It is a happy number.

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 51229997 - 2⁶ = 51229933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51229907) 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, 281393 + ... + 281574.

It is an arithmetic number, because the mean of its divisors is an integer number (7881552).

Almost surely, 2^51229997 is an apocalyptic number.

It is an amenable number.

51229997 is a deficient number, since it is larger than the sum of its proper divisors (11822419).

51229997 is a wasteful number, since it uses less digits than its factorization.

51229997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562987.

The product of its digits is 102060, while the sum is 44.

The square root of 51229997 is about 7157.5133251710. The cubic root of 51229997 is about 371.3996101045.

The spelling of 51229997 in words is "fifty-one million, two hundred twenty-nine thousand, nine hundred ninety-seven".