1201001571 has 96 divisors (see below), whose sum is σ = 2320980480. Its totient is φ = 579571200.

The previous prime is 1201001551. The next prime is 1201001573. The reversal of 1201001571 is 1751001021.

It is a happy number.

It is not a de Polignac number, because 1201001571 - 2⁵ = 1201001539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201001573) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 696991 + ... + 698711.

It is an arithmetic number, because the mean of its divisors is an integer number (24176880).

Almost surely, 2^1201001571 is an apocalyptic number.

1201001571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1201001571 is a deficient number, since it is larger than the sum of its proper divisors (1119978909).

1201001571 is a wasteful number, since it uses less digits than its factorization.

1201001571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 1201001571 is about 34655.4695683091. The cubic root of 1201001571 is about 1062.9541336359.

Adding to 1201001571 its reverse (1751001021), we get a palindrome (2952002592).

The spelling of 1201001571 in words is "one billion, two hundred one million, one thousand, five hundred seventy-one".