1961561046 has 32 divisors (see below), whose sum is σ = 3969209088. Its totient is φ = 646198560.

The previous prime is 1961561039. The next prime is 1961561047. The reversal of 1961561046 is 6401651691.

It is a super-2 number, since 2×1961561046² = 7695443474369228232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1961560995 and 1961561013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961561047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331405 + ... + 337271.

It is an arithmetic number, because the mean of its divisors is an integer number (124037784).

Almost surely, 2^1961561046 is an apocalyptic number.

1961561046 is an abundant number, since it is smaller than the sum of its proper divisors (2007648042).

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

1961561046 is a wasteful number, since it uses less digits than its factorization.

1961561046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 1961561046 is about 44289.5139508214. The cubic root of 1961561046 is about 1251.7971049063.

The spelling of 1961561046 in words is "one billion, nine hundred sixty-one million, five hundred sixty-one thousand, forty-six".