1261651546 has 8 divisors (see below), whose sum is σ = 1895351040. Its totient is φ = 629867868.

The previous prime is 1261651513. The next prime is 1261651553. The reversal of 1261651546 is 6451561621.

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, 477306 + ... + 479941.

It is an arithmetic number, because the mean of its divisors is an integer number (236918880).

Almost surely, 2^1261651546 is an apocalyptic number.

1261651546 is a deficient number, since it is larger than the sum of its proper divisors (633699494).

1261651546 is an equidigital number, since it uses as much as digits as its factorization.

1261651546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957908.

The product of its digits is 43200, while the sum is 37.

The square root of 1261651546 is about 35519.7345992337. The cubic root of 1261651546 is about 1080.5539984647.

The spelling of 1261651546 in words is "one billion, two hundred sixty-one million, six hundred fifty-one thousand, five hundred forty-six".