1261653242 has 8 divisors (see below), whose sum is σ = 1932745536. Its totient is φ = 617404732.

The previous prime is 1261653241. The next prime is 1261653251. The reversal of 1261653242 is 2423561621.

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

It is a super-2 number, since 2×1261653242² = 3183537806098221128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261653199 and 1261653208.

It is not an unprimeable number, because it can be changed into a prime (1261653241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6710828 + ... + 6711015.

It is an arithmetic number, because the mean of its divisors is an integer number (241593192).

Almost surely, 2^1261653242 is an apocalyptic number.

1261653242 is a deficient number, since it is larger than the sum of its proper divisors (671092294).

1261653242 is a wasteful number, since it uses less digits than its factorization.

1261653242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13421892.

The product of its digits is 17280, while the sum is 32.

The square root of 1261653242 is about 35519.7584732779. The cubic root of 1261653242 is about 1080.5544826498.

The spelling of 1261653242 in words is "one billion, two hundred sixty-one million, six hundred fifty-three thousand, two hundred forty-two".