1071720155 has 32 divisors (see below), whose sum is σ = 1442992320. Its totient is φ = 757486080.

The previous prime is 1071720149. The next prime is 1071720157. The reversal of 1071720155 is 5510271701.

It is not a de Polignac number, because 1071720155 - 2¹² = 1071716059 is a prime.

It is a super-2 number, since 2×1071720155² = 2297168181266448050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1071720157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316049 + ... + 319421.

It is an arithmetic number, because the mean of its divisors is an integer number (45093510).

Almost surely, 2^1071720155 is an apocalyptic number.

1071720155 is a deficient number, since it is larger than the sum of its proper divisors (371272165).

1071720155 is a wasteful number, since it uses less digits than its factorization.

1071720155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551.

The product of its (nonzero) digits is 2450, while the sum is 29.

The square root of 1071720155 is about 32737.1372450311. The cubic root of 1071720155 is about 1023.3569249643.

Adding to 1071720155 its reverse (5510271701), we get a palindrome (6581991856).

The spelling of 1071720155 in words is "one billion, seventy-one million, seven hundred twenty thousand, one hundred fifty-five".