1631860061 has 4 divisors (see below), whose sum is σ = 1757387772. Its totient is φ = 1506332352.

The previous prime is 1631860001. The next prime is 1631860063. The reversal of 1631860061 is 1600681361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 511619161 + 1120240900 = 22619^2 + 33470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631860061 - 2²⁶ = 1564751197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631860063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62763836 + ... + 62763861.

It is an arithmetic number, because the mean of its divisors is an integer number (439346943).

Almost surely, 2^1631860061 is an apocalyptic number.

It is an amenable number.

1631860061 is a deficient number, since it is larger than the sum of its proper divisors (125527711).

1631860061 is a wasteful number, since it uses less digits than its factorization.

1631860061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125527710.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1631860061 is about 40396.2877131055. The cubic root of 1631860061 is about 1177.3194109421.

The spelling of 1631860061 in words is "one billion, six hundred thirty-one million, eight hundred sixty thousand, sixty-one".