1261701630 has 128 divisors (see below), whose sum is σ = 3854822400. Its totient is φ = 287667072.

The previous prime is 1261701611. The next prime is 1261701667. The reversal of 1261701630 is 361071621.

1261701630 is a `hidden beast` number, since 1 + 2 + 617 + 0 + 16 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1261701594 and 1261701603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1245004 + ... + 1246016.

It is an arithmetic number, because the mean of its divisors is an integer number (30115800).

Almost surely, 2^1261701630 is an apocalyptic number.

1261701630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261701630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1927411200).

1261701630 is an abundant number, since it is smaller than the sum of its proper divisors (2593120770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261701630 is a wasteful number, since it uses less digits than its factorization.

1261701630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1261701630 is about 35520.4396087661. The cubic root of 1261701630 is about 1080.5682965886.

The spelling of 1261701630 in words is "one billion, two hundred sixty-one million, seven hundred one thousand, six hundred thirty".