1861315425 has 18 divisors (see below), whose sum is σ = 3333823142. Its totient is φ = 992701440.

The previous prime is 1861315399. The next prime is 1861315433. The reversal of 1861315425 is 5245131681.

1861315425 is a `hidden beast` number, since 1 + 8 + 613 + 15 + 4 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 538611264 + 1322704161 = 23208^2 + 36369^2 .

It is not a de Polignac number, because 1861315425 - 2¹² = 1861311329 is a prime.

It is a super-2 number, since 2×1861315425² = 6928990222685861250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861315425.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4136032 + ... + 4136481.

Almost surely, 2^1861315425 is an apocalyptic number.

1861315425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1861315425 is a deficient number, since it is larger than the sum of its proper divisors (1472507717).

1861315425 is a wasteful number, since it uses less digits than its factorization.

1861315425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272529 (or 8272521 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1861315425 is about 43142.9649537442. The cubic root of 1861315425 is about 1230.0987923822.

The spelling of 1861315425 in words is "one billion, eight hundred sixty-one million, three hundred fifteen thousand, four hundred twenty-five".