1561455070 has 48 divisors (see below), whose sum is σ = 3349282608. Its totient is φ = 522291840.

The previous prime is 1561455059. The next prime is 1561455079. The reversal of 1561455070 is 705541651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561455079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18772 + ... + 58951.

It is an arithmetic number, because the mean of its divisors is an integer number (69776721).

Almost surely, 2^1561455070 is an apocalyptic number.

1561455070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561455070 is an abundant number, since it is smaller than the sum of its proper divisors (1787827538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561455070 is a wasteful number, since it uses less digits than its factorization.

1561455070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77785 (or 77778 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1561455070 is about 39515.2511063766. The cubic root of 1561455070 is about 1160.1384768295.

The spelling of 1561455070 in words is "one billion, five hundred sixty-one million, four hundred fifty-five thousand, seventy".