1601101551 has 16 divisors (see below), whose sum is σ = 2441088000. Its totient is φ = 914422368.

The previous prime is 1601101529. The next prime is 1601101583. The reversal of 1601101551 is 1551011061.

It is a happy number.

It is not a de Polignac number, because 1601101551 - 2¹³ = 1601093359 is a prime.

It is a super-2 number, since 2×1601101551² = 5127052353229211202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601101351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21370 + ... + 60488.

It is an arithmetic number, because the mean of its divisors is an integer number (152568000).

Almost surely, 2^1601101551 is an apocalyptic number.

1601101551 is a deficient number, since it is larger than the sum of its proper divisors (839986449).

1601101551 is a wasteful number, since it uses less digits than its factorization.

1601101551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41078.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 1601101551 is about 40013.7670183651. The cubic root of 1601101551 is about 1169.8754465993.

The spelling of 1601101551 in words is "one billion, six hundred one million, one hundred one thousand, five hundred fifty-one".