851451949 has 8 divisors (see below), whose sum is σ = 861332472. Its totient is φ = 841612800.

The previous prime is 851451941. The next prime is 851451971. The reversal of 851451949 is 949154158.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74046025 + 777405924 = 8605^2 + 27882^2 .

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 851451949 - 2³ = 851451941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851451899 and 851451908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851451941) 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, 32049 + ... + 52249.

It is an arithmetic number, because the mean of its divisors is an integer number (107666559).

Almost surely, 2^851451949 is an apocalyptic number.

It is an amenable number.

851451949 is a deficient number, since it is larger than the sum of its proper divisors (9880523).

851451949 is a wasteful number, since it uses less digits than its factorization.

851451949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20687.

The product of its digits is 259200, while the sum is 46.

The square root of 851451949 is about 29179.6495695202. The cubic root of 851451949 is about 947.8072970993.

The spelling of 851451949 in words is "eight hundred fifty-one million, four hundred fifty-one thousand, nine hundred forty-nine".