1261606546 has 8 divisors (see below), whose sum is σ = 1957665420. Its totient is φ = 609051408.

The previous prime is 1261606487. The next prime is 1261606589. The reversal of 1261606546 is 6456061621.

It can be written as a sum of positive squares in 2 ways, for example, as 1187560521 + 74046025 = 34461^2 + 8605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10875861 + ... + 10875976.

Almost surely, 2^1261606546 is an apocalyptic number.

1261606546 is a deficient number, since it is larger than the sum of its proper divisors (696058874).

1261606546 is a wasteful number, since it uses less digits than its factorization.

1261606546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21751868.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1261606546 is about 35519.1011429062. The cubic root of 1261606546 is about 1080.5411514130.

The spelling of 1261606546 in words is "one billion, two hundred sixty-one million, six hundred six thousand, five hundred forty-six".