901551 has 12 divisors (see below), whose sum is σ = 1398552. Its totient is φ = 515088.

The previous prime is 901547. The next prime is 901567. The reversal of 901551 is 155109.

It is a happy number.

It is not a de Polignac number, because 901551 - 2² = 901547 is a prime.

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

It is the 950-th Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901501) by changing a digit.

It is a nontrivial repunit in base 949.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2920 + ... + 3213.

It is an arithmetic number, because the mean of its divisors is an integer number (116546).

2⁹⁰¹⁵⁵¹ is an apocalyptic number.

901551 is a deficient number, since it is larger than the sum of its proper divisors (497001).

901551 is a wasteful number, since it uses less digits than its factorization.

901551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150 (or 6143 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 901551 is about 949.5003949446. The cubic root of 901551 is about 96.6043686325.

The spelling of 901551 in words is "nine hundred one thousand, five hundred fifty-one".