1261257150 has 48 divisors (see below), whose sum is σ = 3157190784. Its totient is φ = 333187680.

The previous prime is 1261257139. The next prime is 1261257157. The reversal of 1261257150 is 517521621.

1261257150 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1261257150² = 3181539196852245000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261257157) 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, 23242 + ... + 55341.

It is an arithmetic number, because the mean of its divisors is an integer number (65774808).

Almost surely, 2^1261257150 is an apocalyptic number.

1261257150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261257150 is an abundant number, since it is smaller than the sum of its proper divisors (1895933634).

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

1261257150 is a wasteful number, since it uses less digits than its factorization.

1261257150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78705 (or 78700 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1261257150 is about 35514.1823783119. The cubic root of 1261257150 is about 1080.4413919396.

Adding to 1261257150 its reverse (517521621), we get a palindrome (1778778771).

The spelling of 1261257150 in words is "one billion, two hundred sixty-one million, two hundred fifty-seven thousand, one hundred fifty".