1261722050 has 48 divisors (see below), whose sum is σ = 2414845440. Its totient is φ = 490220160.

The previous prime is 1261722047. The next prime is 1261722061. The reversal of 1261722050 is 502271621.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 319991 + ... + 323909.

It is an arithmetic number, because the mean of its divisors is an integer number (50309280).

Almost surely, 2^1261722050 is an apocalyptic number.

1261722050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261722050 is a deficient number, since it is larger than the sum of its proper divisors (1153123390).

1261722050 is a wasteful number, since it uses less digits than its factorization.

1261722050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115 (or 4110 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1261722050 is about 35520.7270477393. The cubic root of 1261722050 is about 1080.5741260401.

Adding to 1261722050 its reverse (502271621), we get a palindrome (1763993671).

The spelling of 1261722050 in words is "one billion, two hundred sixty-one million, seven hundred twenty-two thousand, fifty".