1501551 has 16 divisors (see below), whose sum is σ = 2342400. Its totient is φ = 948024.

The previous prime is 1501541. The next prime is 1501561. The reversal of 1501551 is 1551051.

It is an interprime number because it is at equal distance from previous prime (1501541) and next prime (1501561).

It is a de Polignac number, because none of the positive numbers 2^k-1501551 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1501501) 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, 951 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (146400).

2^1501551 is an apocalyptic number.

1501551 is a deficient number, since it is larger than the sum of its proper divisors (840849).

1501551 is a wasteful number, since it uses less digits than its factorization.

1501551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 18.

The square root of 1501551 is about 1225.3779008943. The cubic root of 1501551 is about 114.5108651487.

The spelling of 1501551 in words is "one million, five hundred one thousand, five hundred fifty-one".