1864685961 has 8 divisors (see below), whose sum is σ = 2762497760. Its totient is φ = 1243123956.

The previous prime is 1864685959. The next prime is 1864685989. The reversal of 1864685961 is 1695864681.

1864685961 is a `hidden beast` number, since 1 + 8 + 6 + 46 + 8 + 596 + 1 = 666.

It is not a de Polignac number, because 1864685961 - 2¹ = 1864685959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1864685898 and 1864685907.

It is not an unprimeable number, because it can be changed into a prime (1864685951) 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, 34531195 + ... + 34531248.

It is an arithmetic number, because the mean of its divisors is an integer number (345312220).

Almost surely, 2^1864685961 is an apocalyptic number.

It is an amenable number.

1864685961 is a deficient number, since it is larger than the sum of its proper divisors (897811799).

1864685961 is an equidigital number, since it uses as much as digits as its factorization.

1864685961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69062452 (or 69062446 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 1864685961 is about 43182.0096915371. The cubic root of 1864685961 is about 1230.8408468260.

The spelling of 1864685961 in words is "one billion, eight hundred sixty-four million, six hundred eighty-five thousand, nine hundred sixty-one".