1906531 has 8 divisors (see below), whose sum is σ = 2147328. Its totient is φ = 1677000.

The previous prime is 1906523. The next prime is 1906537. The reversal of 1906531 is 1356091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1906531 - 2³ = 1906523 is a prime.

It is a super-2 number, since 2×1906531² = 7269720907922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1906496 and 1906505.

It is not an unprimeable number, because it can be changed into a prime (1906537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2455 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (268416).

2^1906531 is an apocalyptic number.

1906531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1906531 is the 618-th centered decagonal number.

1906531 is a deficient number, since it is larger than the sum of its proper divisors (240797).

1906531 is a wasteful number, since it uses less digits than its factorization.

1906531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1906531 is about 1380.7718855770. The cubic root of 1906531 is about 123.9979838382.

The spelling of 1906531 in words is "one million, nine hundred six thousand, five hundred thirty-one".