1261401150 has 48 divisors (see below), whose sum is σ = 3149048448. Its totient is φ = 334140000.

The previous prime is 1261401149. The next prime is 1261401157. The reversal of 1261401150 is 511041621.

It is a super-2 number, since 2×1261401150² = 3182265722442645000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261401157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5196 + ... + 50495.

It is an arithmetic number, because the mean of its divisors is an integer number (65605176).

Almost surely, 2^1261401150 is an apocalyptic number.

1261401150 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 1261401150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574524224).

1261401150 is an abundant number, since it is smaller than the sum of its proper divisors (1887647298).

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

1261401150 is a wasteful number, since it uses less digits than its factorization.

1261401150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55857 (or 55852 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1261401150 is about 35516.2096795252. The cubic root of 1261401150 is about 1080.4825090213.

Adding to 1261401150 its reverse (511041621), we get a palindrome (1772442771).

The spelling of 1261401150 in words is "one billion, two hundred sixty-one million, four hundred one thousand, one hundred fifty".