1016381531 has 32 divisors (see below), whose sum is σ = 1199923200. Its totient is φ = 851760000.

The previous prime is 1016381519. The next prime is 1016381537. The reversal of 1016381531 is 1351836101.

It is a cyclic number.

It is not a de Polignac number, because 1016381531 - 2⁶ = 1016381467 is a prime.

It is a super-2 number, since 2×1016381531² = 2066062833115807922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 1016381494 and 1016381503.

It is not an unprimeable number, because it can be changed into a prime (1016381537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 780581 + ... + 781881.

It is an arithmetic number, because the mean of its divisors is an integer number (37497600).

Almost surely, 2^1016381531 is an apocalyptic number.

1016381531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1016381531 is the 14258-th centered decagonal number.

1016381531 is a deficient number, since it is larger than the sum of its proper divisors (183541669).

1016381531 is a wasteful number, since it uses less digits than its factorization.

1016381531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1016381531 is about 31880.7391852824. The cubic root of 1016381531 is about 1005.4309615935.

The spelling of 1016381531 in words is "one billion, sixteen million, three hundred eighty-one thousand, five hundred thirty-one".