1551216946 has 16 divisors (see below), whose sum is σ = 2398292928. Its totient is φ = 752144400.

The previous prime is 1551216941. The next prime is 1551216949. The reversal of 1551216946 is 6496121551.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1551216899 and 1551216908.

It is not an unprimeable number, because it can be changed into a prime (1551216941) 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, 80880 + ... + 98203.

It is an arithmetic number, because the mean of its divisors is an integer number (149893308).

Almost surely, 2^1551216946 is an apocalyptic number.

1551216946 is a deficient number, since it is larger than the sum of its proper divisors (847075982).

1551216946 is a wasteful number, since it uses less digits than its factorization.

1551216946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179217.

The product of its digits is 64800, while the sum is 40.

The square root of 1551216946 is about 39385.4915673272. The cubic root of 1551216946 is about 1157.5973222145.

The spelling of 1551216946 in words is "one billion, five hundred fifty-one million, two hundred sixteen thousand, nine hundred forty-six".