1261556030 has 32 divisors (see below), whose sum is σ = 2597736960. Its totient is φ = 432110880.

The previous prime is 1261556027. The next prime is 1261556041. The reversal of 1261556030 is 306551621.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1261555984 and 1261556002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68111 + ... + 84629.

It is an arithmetic number, because the mean of its divisors is an integer number (81179280).

Almost surely, 2^1261556030 is an apocalyptic number.

1261556030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261556030 is an abundant number, since it is smaller than the sum of its proper divisors (1336180930).

1261556030 is a wasteful number, since it uses less digits than its factorization.

1261556030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17624.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1261556030 is about 35518.3900254502. The cubic root of 1261556030 is about 1080.5267292342.

The spelling of 1261556030 in words is "one billion, two hundred sixty-one million, five hundred fifty-six thousand, thirty".