1561061212 has 6 divisors (see below), whose sum is σ = 2731857128. Its totient is φ = 780530604.

The previous prime is 1561061189. The next prime is 1561061219. The reversal of 1561061212 is 2121601651.

It is a happy number.

It is a super-2 number, since 2×1561061212² = 4873824215221817888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561061219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195132648 + ... + 195132655.

Almost surely, 2^1561061212 is an apocalyptic number.

It is an amenable number.

1561061212 is a deficient number, since it is larger than the sum of its proper divisors (1170795916).

1561061212 is a wasteful number, since it uses less digits than its factorization.

1561061212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390265307 (or 390265305 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1561061212 is about 39510.2671719643. The cubic root of 1561061212 is about 1160.0409250326.

Adding to 1561061212 its reverse (2121601651), we get a palindrome (3682662863).

The spelling of 1561061212 in words is "one billion, five hundred sixty-one million, sixty-one thousand, two hundred twelve".