1820472951 has 12 divisors (see below), whose sum is σ = 2668021496. Its totient is φ = 1103316720.

The previous prime is 1820472937. The next prime is 1820472971. The reversal of 1820472951 is 1592740281.

1820472951 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1820472951 - 2⁶ = 1820472887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820472971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2507176 + ... + 2507901.

Almost surely, 2^1820472951 is an apocalyptic number.

1820472951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1820472951 is a deficient number, since it is larger than the sum of its proper divisors (847548545).

1820472951 is a wasteful number, since it uses less digits than its factorization.

1820472951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015102 (or 5015091 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 1820472951 is about 42667.0007265568. Note that the first 3 decimals coincide. The cubic root of 1820472951 is about 1221.0348987671.

The spelling of 1820472951 in words is "one billion, eight hundred twenty million, four hundred seventy-two thousand, nine hundred fifty-one".