51629081 has 4 divisors (see below), whose sum is σ = 59004672. Its totient is φ = 44253492.

The previous prime is 51629069. The next prime is 51629087. The reversal of 51629081 is 18092615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18092615 = 5 ⋅3618523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51629081 is a prime.

It is a super-2 number, since 2×51629081² = 5331124009809122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51629087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3687785 + ... + 3687798.

It is an arithmetic number, because the mean of its divisors is an integer number (14751168).

Almost surely, 2^51629081 is an apocalyptic number.

It is an amenable number.

51629081 is a deficient number, since it is larger than the sum of its proper divisors (7375591).

51629081 is an equidigital number, since it uses as much as digits as its factorization.

51629081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7375590.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 51629081 is about 7185.3379182889. The cubic root of 51629081 is about 372.3615232315.

The spelling of 51629081 in words is "fifty-one million, six hundred twenty-nine thousand, eighty-one".