1261632542 has 8 divisors (see below), whose sum is σ = 1893014496. Its totient is φ = 630627712.

The previous prime is 1261632529. The next prime is 1261632553. The reversal of 1261632542 is 2452361621.

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

It is a junction number, because it is equal to n+sod(n) for n = 1261632499 and 1261632508.

It is a congruent number.

It is an unprimeable number.

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, 85763 + ... + 99390.

It is an arithmetic number, because the mean of its divisors is an integer number (236626812).

Almost surely, 2^1261632542 is an apocalyptic number.

1261632542 is a deficient number, since it is larger than the sum of its proper divisors (631381954).

1261632542 is a wasteful number, since it uses less digits than its factorization.

1261632542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188562.

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

The square root of 1261632542 is about 35519.4670849662. The cubic root of 1261632542 is about 1080.5485730493.

The spelling of 1261632542 in words is "one billion, two hundred sixty-one million, six hundred thirty-two thousand, five hundred forty-two".