861404545 has 32 divisors (see below), whose sum is σ = 1092672000. Its totient is φ = 651006720.

The previous prime is 861404519. The next prime is 861404591. The reversal of 861404545 is 545404168.

861404545 = 2365² + 2366² + ... + 2509².

It is not a de Polignac number, because 861404545 - 2¹⁷ = 861273473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1591975 + ... + 1592515.

It is an arithmetic number, because the mean of its divisors is an integer number (34146000).

Almost surely, 2^861404545 is an apocalyptic number.

It is an amenable number.

861404545 is a deficient number, since it is larger than the sum of its proper divisors (231267455).

861404545 is a wasteful number, since it uses less digits than its factorization.

861404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793.

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 861404545 is about 29349.6941210637. The cubic root of 861404545 is about 951.4859644180.

The spelling of 861404545 in words is "eight hundred sixty-one million, four hundred four thousand, five hundred forty-five".