51231445 has 8 divisors (see below), whose sum is σ = 61608960. Its totient is φ = 40897680.

The previous prime is 51231409. The next prime is 51231449. The reversal of 51231445 is 54413215.

It is a happy number.

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

It is not a de Polignac number, because 51231445 - 2¹⁵ = 51198677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51231449) 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, 8301 + ... + 13090.

It is an arithmetic number, because the mean of its divisors is an integer number (7701120).

Almost surely, 2^51231445 is an apocalyptic number.

It is an amenable number.

51231445 is a deficient number, since it is larger than the sum of its proper divisors (10377515).

51231445 is a wasteful number, since it uses less digits than its factorization.

51231445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21875.

The product of its digits is 2400, while the sum is 25.

The square root of 51231445 is about 7157.6144769050. The cubic root of 51231445 is about 371.4031092365.

The spelling of 51231445 in words is "fifty-one million, two hundred thirty-one thousand, four hundred forty-five".