1645540941 has 16 divisors (see below), whose sum is σ = 2432755008. Its totient is φ = 980947200.

The previous prime is 1645540927. The next prime is 1645540987. The reversal of 1645540941 is 1490455461.

It is not a de Polignac number, because 1645540941 - 2⁶ = 1645540877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645540941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645540901) 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, 406716 + ... + 410741.

It is an arithmetic number, because the mean of its divisors is an integer number (152047188).

Almost surely, 2^1645540941 is an apocalyptic number.

1645540941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1645540941 is a deficient number, since it is larger than the sum of its proper divisors (787214067).

1645540941 is a wasteful number, since it uses less digits than its factorization.

1645540941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817532.

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 1645540941 is about 40565.2676682898. The cubic root of 1645540941 is about 1180.6003219897.

The spelling of 1645540941 in words is "one billion, six hundred forty-five million, five hundred forty thousand, nine hundred forty-one".