1101561542 has 4 divisors (see below), whose sum is σ = 1652342316. Its totient is φ = 550780770.

The previous prime is 1101561541. The next prime is 1101561547. The reversal of 1101561542 is 2451651011.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101561541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275390384 + ... + 275390387.

It is an arithmetic number, because the mean of its divisors is an integer number (413085579).

Almost surely, 2^1101561542 is an apocalyptic number.

1101561542 is a deficient number, since it is larger than the sum of its proper divisors (550780774).

1101561542 is an equidigital number, since it uses as much as digits as its factorization.

1101561542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550780773.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1101561542 is about 33189.7806862293. The cubic root of 1101561542 is about 1032.7683538175.

The spelling of 1101561542 in words is "one billion, one hundred one million, five hundred sixty-one thousand, five hundred forty-two".